For thousands of years
doctors told patients suffering from pain to chew on the bark of a willow
tree. Even as far back as 400 B.C. Hippocrates recommended a tea made
from yellow leaves. It wasn't until the 1800's that scientists discovered what
was in the willow tree that relieved pain and reduced fever. What was the
substance called?
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The effects
of aspirin-like substances have been known since the ancient Romans recorded
the use of the willow bark as a fever fighter. The leaves and bark of the
willow tree contain a substance called salicin, a
naturally occurring compound similar to acetylsalicylic acid, the chemical
name for aspirin. Even as
far back as 400 B.C. Hippocrates recommended a tea made from yellow leaves.
It wasn't until the 1800's that scientists discovered what was in the willow
tree that relieved pain and reduced fever. The substance was named salicylic
acid. |
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But when
people suffering from pain took the salicylic acid, it caused sever stomach
and mouth irritation. In 1832, a thirty-seven-year-old French chemist named
Charles Gergardt mixed another chemical with the
acid and produced good results, but the procedure was difficult and took a
lot of time. Gerhardt decided the new compound wasn't practial,
so he set aside. |
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Sixty-five-years
later a German chemist, Felix Hoffman, was searching for something to relieve
his father's arthritis. He studied Gerhardt's experiments and
"rediscovered" acetylsalicylic acid--or aspirin, as we now know it.
Charles Gerhardt had mistakenly thought his compound was not useful, but
today over 70 million pounds of it are produced annually all over the
world. American's take more then 15 billion tablets a year, making it |
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It started in the
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It started
here and has conquered the world. When the big international push came in the
fifties and sixties, American tourists were stunned to discover that in
countries like |
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Coca-Cola
probably has every bit as much to do with |
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The formula
changed hands three more times before Asa D.
Chandler hit upon the idea of carbonating the drink. The bubbles made all the
difference, and he struck gold. The Coca-Cola Company was founded in 1892 and
has never looked back. |
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In 1912 Walter Deubner was looking for a way to give his business a boost.
He invented a product that helped his customers go from buying in 10 pound
quantities to buying in seventy-five pound quantities. What was his invention
called?
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Walter H. Deubner ran a small grocery store in |
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By careful
observation, he noticed that his customers purchases
were limited by what they could conveniently carry. So he set about devising
a way to help them buy more purchases at one time. It took him four years to
develop the right solution: a prefabricated package, inexpensive, easy to
use-and strong enough to carry up to seventy-five pounds worth of groceries. |
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The package
consisted of a paper bag with cord running through it for strength. Deubner named his new product after himself, calling it
the "Deubner Shopping Bag," and sold it
for five cents. Deubner patented his product and
within three years, by 1915, was selling over a million shopping bags a year. |
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An American Indian of the
Huron tribe long ago invented a snack food that became very popular with the
new Americans, so popular that sales now exceed over four billion dollars a
year. What is this snack food called?
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As a world food, potatoes are second in human consumption only
to rice. And as thin, salted, crisp chips, they are In the summer of
1853, Native American George Crum was employed as a chef at an elegant resort
in |
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At Moon Lake Lodge, one dinner guest found chef Crum's French
fries too thick for his liking and rejected the order. Crum cut and fried a
thinner batch, but these, too, met with disapproval. Exasperated, Crum
decided to rile the guest by producing French fries too thin and crisp to
skewer with a fork.The plan backfired. The guest
was ecstatic over the browned, paper-thin potatoes, and other diners
requested Crum's potato chips, which began to appear on the menu as Saratoga
Chips, a house specialty. |
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Soon they were packaged and sold, first locally, then throughout
the For several decades
after their creation, potato chips were largely a Northern dinner dish. In
the 1920s, Herman Lay, a traveling salesman in the South, helped popularize
the food from |
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People all over the world
made this item from grape vines and stiff grasses as both a religious adornment
and as an item of amusement. It took a couple of Americans, however, to
figure out how to make money out of it. What was this item called?
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You may think
that the Hula Hoop was a fad born in the 1950s, but in fact people were doing
much the same thing with circular hoops made from grape vines and stiff
grasses all over the ancient world. More than three thousand years ago,
children in |
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During the
fourteenth century, a "hooping" craze
swept |
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The item
attracted the attention of Wham-0, a fledgling |
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What flip-flops as much as
Bill Clinton and is still popular with the American public, after all these
years? It flip-flops all over the place, especially down stairs.
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In 1943. during World War II, an engineer in the United States Navy
was on a new ship's run. As he worked, a torsion spring suddenly fell to the
floor. the spring flip-flopped as the ingenious man
watched. The naval engineer's name was Richard James, and when he returned
home, he remembered the spring and the interesting way it flip-flopped. James
and his wife Betty perfected a long steel ribbon tightly coiled into a
spiral. |
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They began
production in 1945. From that spring's accidental fall came a toy Americans
have enjoyed for over fifty years, the Slinky. The non-electrical,
no-battery-required, non-video toy has fascinated three generations of
children and adults alike. According to one estimate more than 250 million Slinkys have been sold and the only change in the
original design has been to crimp the ends as a safety measure. |
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Who was the person who
designed the (
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The man
credited with designing the American flag is Bob Heft. He earned his place in
history in 1958 while living with his grandparents in His updated 50-star flag was a class
project later adopted by presidential proclamation after As a 17-year-old high school junior,
Heft found himself in need of a class project. His proposed flag idea was initially
turned down by the teacher. He went ahead and finished his project, receiving
a B minus for his efforts. Heft's teacher compromised and promised to deliver
a better classroom grade if he could get the U.S. Congress to accept his
flag. The rest is history. |
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Alexander Graham Bell |
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Since the age of 18, In 1880 After 1895 |
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Probably no means of communication has revolutionized the daily
lives of ordinary people more than the telephone. Simply described, it is a
system which converts sound, specifically the human voice, to electrical
impulses of various frequencies and then back to a tone that sounds like the
original voice. In 1831, Englishman Michael Faraday (1791-1867) proved that
vibrations of metal could be converted to electrical impulses. This was the
technological basis of the telephone, but no one actually used this system to
transmit sound until 1861. In that year, Johann Philip Reis (1834-1874) in |
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A practical telephone was actually invented independently by
two men working in the According to the
famous story, the first fully intelligible telephone call occurred on |
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Watson heard the request through a receiver connected to the
transmitter that Bell had designed, and what followed after that is a history
of the founding of the Bell Telephone Company (later AT&T), which grew to
be the largest telephone company in the world. The first telephone
system, known as an exchange, which is a practical means of communicating
between many people who have telephones, was installed in The coin operated pay
telephone was patented by William Gray of In 1978, American
Telephone and Telegraph’s (AT&T) Bell Laboratories began testing a mobile
telephone system based on hexagonal geographical regions called cells. As the
caller’s vehicle passed from one cell to another, an automatic switching
system would transfer the telephone call to another cell without
interruption. The cellular telephone system began nationwide usage in the |
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For thousands
of years, man has walked through fields of weeds and arrived home with burrs
stuck to his clothing. It’s amazing no one took advantage of the problem
until 1948. George de Mestral, a Swiss engineer,
returned from a walk one day in 1948 and found some cockleburs clinging to
his cloth jacket. When de Mestral loosened them, he
examined one under his microscope. The principle was simple. The cocklebur is
a maze of thin strands with burrs (or hooks) on the ends that cling to
fabrics or animal fur. By the accident of the cockleburs sticking to his
jacket, George de Mestral recognized the potential
for a practical new fastener. It took eight years to experiment, develop, and
perfect the invention, which consists of two strips of nylon fabric. One
strip contains thousands of small hooks. The other strip contains small
loops. When the two strips are pressed together, they form a strong
bond. VELCRO, the name de Mestral gave his
product, is the brand most people in the |
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Everyone
knows what Post-it notes are: They are those great little self-stick
notepapers. Most people have Post-it Notes. Most people use
them. Most people love them. But Post-it Notes were not a planned
product. |
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No one got
the idea and then stayed up nights to invent it. A man named Spencer
Silver was working in the 3M research laboratories in 1970 trying to find a
strong adhesive. Silver developed a new adhesive, but it was even
weaker than what 3M already manufactured. It stuck to objects, but
could easily be lifted off. It was super weak instead of super
strong. |
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No one knew
what to do with the stuff, but Silver didn't discard it. Then one
Sunday four years later, another 3M scientist named Arthur Fry was singing in
the church's choir. He used markers to keep
his place in the hymnal, but they kept falling out of the book.
Remembering Silver's adhesive, Fry used some to coat his markers.
Success! With the weak adhesive, the markers stayed in place, yet
lifted off without damaging the pages. 3M began distributing Post-it
Notes nationwide in 1980 -- ten years after Silver developed the super weak
adhesive. Today they are one of the most popular office products
available. Post-it® |
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You know that
white stuff you paint on paper to cover mistakes? It was originally called
"mistake out" and was the invention of Bette Nesmith Graham, a
divorcee who went to work in 1951 to support herself and her son. |
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Though she
found work as a typist, she unfortunately wasn't a very good one and
developed a white tempura paint to hide her mistakes. Using her kitchen and
garage as laboratory and factory, she gradually developed a product that
other secretaries and office workers began to buy. While continuing to work
as a secretary, she educated herself in business methods, promotion, and
research until she was satisfied that the product she had developed was
really worthwhile. She then offered Mistake Out to IBM which turned it down. |
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Undaunted,
Bette Graham changed the name from Mistake Out to Liquid Paper and kept
selling it from her kitchen-garage for the next 17 years. By 1968 she was
making a profit. And in 1979, the Gillette Corporation bought Liquid Paper
for $47.5 million plus royalties. She was also the mother of Michael Nesmith,
a member of The Monkees. |
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One morning
in 1903, Albert J. Parkhouse arrived as usual at
his workplace, the Timberlake Wire and Novelty Company in |
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Annoyed-and
inspired-Parkhouse picked up a piece of wire, bent
it into two large oblong hoops opposite each other, and twisted both ends at
the center into a hook. Then he hung up his coat and went to work. The
company apparently thought it was a good idea, because they took out a patent
on it. In those days, companies were allowed to take out patents on any of
their employees’ inventions. The company made a fortune; Parkhouse
never got a penny. |
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Ivory Soap is 99 44/100 percent pure .... and it FLOATS! Did it take years of experimenting to
get that soap to float? Not exactly. Ivory Soap floated by
accident. For years the Procter & Gamble company had been
developing a formula for a high quality soap at an
affordable price. In January 1878, they finally perfected the formula. They
called it simply "White Soap," and began production. Several
months later the accident occurred. |
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A large batch
of White Soap was mixing when a workman at the factory went to lunch and left
the machinery running. When he returned, he found that air had been
worked into the mixture. he decided not to discard
the batch of soap because of such a small error, and he poured the soap into
the frames. The soap hardened and it was cut, packaged, and shipped. |
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A few weeks
later, letters began arriving at Procter & Gamble asking for more of the
soap that floated. The workman's error had turned into a selling
point! Harley Procter came up with the name :Ivory"
while listening to a bible reading at church one morning in 1879. |
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Consider the
humble paper clip: It’s just a thin piece of steel wire bent into a
double-oval shape, but over the past century, no one has invented a better
method of holding loose sheets of paper together. |
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Its invention
in 1899 is credited to a Norwegian named Johan Vaaler,
who patented the device in |
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The common
paper clip is a wonder of simplicity and function, so it seems puzzling that
it wasn’t invented earlier. For centuries, straight pins, string and other
materials were used as fasteners, but they punctured or damaged the papers.
While the paper clip seems like such an obvious solution, its success had to
wait for the invention of steel wire, which was "elastic" enough to
be stretched, bent and twisted. The design was perfected further by rounding
the sharp points of the wire so they wouldn’t catch, scratch or tear the
papers. By 1907, the Gem brand rose to
prominence with a "slide on," double-U style paper clip that
"will hold securely your letters, documents, or memoranda without
perforation or mutilation until you wish to release them." Although some
dispute the originator of the paper clip, Norwegians have proudly embraced
their countryman, Johan Vaaler, as the true
inventor. During the Nazi occupation of Although colorful plastic materials
and new shapes have challenged the double-oval steel-wire paper clip over the
years, none has proven superior. The traditional paper clip is the essence of
form follows function. After a century, it still works. |
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In 1912, when
candy maker Clarence Crane first marketed "Crane’s Peppermint Life
Savers," life preservers were just beginning to be used on ships-the
round kind with a hole in the center for tossing to a passenger fallen
overboard. But that is not the whole story. Crane had been basically a
chocolate maker. Chocolates were hard to sell in summer, however, and so he
decided to try to make a mint that would boost his summertime sales. At that
time most of the mints available came from |
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In 1900, in
the |
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The Gold Rush
of 1848 attracted many adventurers to |
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In this
manner he earned his way, and by the time he reached |
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Frank
Epperson, a then eleven-year-old, invented the the
Popsicle and the invention was accidental. |
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One day Frank
mixed some soda water powder and water, which was a popular drink in those
days. He left the mixture on the back porch overnight with the stirring
stick still in it. The temperature dropped to a record low that night
and the next day Frank had a stick of frozen soda water to show his friends
at school. Eighteen years later-in 1923- Frank Epperson remembered his
frozen soda water mixture and began a business producing Epsicles
in seven fruit flavors. The name was later changed to the
Popsicle. One estimate says three million Popsicle frozen treats are
sold each year. There are more them thirty different flavors to choose
from, but Popsicle Industries says the general flavor favorite through the
years has remained "taste-tingling orange". |
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What kind of
world would this be without tea? |
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One day Shen Nung was boiling water
outside when leaves from a nearby bush fell into the open kettle. Before Shen Nung could retrieve the
leaves, they began to brew. He smelled the sweet aroma of the mixture and
once he tasted it, the world was given tea! Tea is the most popular beverage
in the world today-after plain water. It was introduced in |
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Back in 1930,
Kenneth and Ruth Wakefield purchased a Cape Cod-style toll house located
halfway between |
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Here,
passengers paid toll, changed horses, and ate much-welcomed home-cooked
meals. It was also here, over 200 years later, that the |
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As she
improved upon traditional Colonial recipes, Ruth's incredible desserts began
attracting people from all over |
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Ruth
eventually approached Nestlé and together, they reached an agreement that
allowed Nestle to print what would become the Toll House Cookie recipe on the
wrapper of the Semi-Sweet Chocolate Bar. Part of this agreement included
supplying Ruth with all of the chocolate she could use to make her delicious
cookies for the rest of her life. |
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As the
popularity of the Toll House cookie continued to grow Nestle looked for ways
to make it easier for people to bake. Soon, they began scoring the Semi-Sweet
Chocolate Bar, and packaged it with a special chopper for easily cutting it
into small morsels. Shortly after, in 1939, they began offering tiny pieces
of chocolate in convenient, ready-to-use packages and that is how the first
Nestlé Toll House Real Semi-Sweet Chocolate Morsels were introduced. |
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Wheaties is a genuine American icon. The familiar orange box and the
slogan "The Breakfast of Champions" have become more than
just advertising symbols. They have become a metaphor for sports greatness
and success. Many athletes, at the pinnacle of their success, have
shared their childhood dreams about someday joining the legends who have had their picture on a Wheaties
box. And, indeed, Wheaties is a delicious, healthy product that has helped fuel and inspire
many a champion. But the legend and lore of this famous orange box -
and the many champions it has featured over the years - is a story in
itself. |
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The
Invention |
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The head
miller, George Cormack, took on the task of trying
to strengthen the flakes to keep them from turning to dust inside a cereal
box. Cormack tested 36 varieties of wheat before he
developed the perfect flake. A company wide contest was held to name the new
cereal. The winner was Jane Bausman, the wife of
the export manager. Wheaties was chosen over
numerous other entries, including Nutties and Gold
Medal Wheat Flakes. |
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Wheaties -- The Breakfast of Champions |
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Knox Reeves,
an advertising executive for Wheaties'
Minneapolis-based agency, was asked what should be printed on the sign. He
took out a pad and pencil, sketched a Wheaties
box, thought for a moment, and then printed "Wheaties
- The Breakfast of Champions." |
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Fascinating facts about
the invention of the Fax Machine by inventors Alexander Bain, Elisha Gray, Arthur Korn, and Edouard Belin beginning in 1843. |
FAX MACHINE |
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The use of
the fax machine to transmit images via telephone lines did not become common
in American businesses until the late 1980s, but the technology dates back to
the nineteenth century. In 1843 in |
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In 1862, the
Italian physicist Giovanni Caselli built a machine
he called a pantelegraph (implying a hybrid of
pantograph and telegraph), which was based on Bain’s invention but also
included a synchronizing apparatus. His pantelegraph
was used by the French Post & Telegraph agency between Elisha Gray (1835-1901), American inventor,
born in In 1902, Arthur Korn
(1870-1945) in In 1925, Edouard
Belin (1876-1963) in For many years, facsimile machines
remained cumbersome, expensive and difficult to operate, but in 1966 Xerox
introduced the Magnafax Telecopier,
a smaller, 46-pound (17 kg) facsimile machine that was easier to use and
could be connected to any telephone line. Using this machine, a letter-sized
document took about six minutes to transmit. The process was slow, but it
represented a major technological step. In the late 1970s, Japanese companies
entered the market, and soon a new generation of faster, smaller and more
efficient fax machines became available. |
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Personal Computers, microcomputers
were made possible by two technical innovations in the field of
microelectronics: the integrated circuit, or IC, which was developed in 1959;
and the microprocessor, which first appeared in 1971. The IC permitted the
miniaturization of computer-memory circuits, and the microprocessor reduced
the size of a computer's CPU to the size of a single silicon chip. The invention of the microprocessor, a
machine which combines the equivalent of thousands of
transistors on a single, tiny silicon chip, was developed by Ted Hoff
at Intel Corporation in the Santa Clara Valley south of San Francisco,
California, an area that was destined to become known to the world as Silicon
Valley because of the microprocessor and computer industry that grew up
there. Because a CPU calculates, performs logical operations, contains
operating instructions, and manages data flows, the potential existed for
developing a separate system that could function as a complete microcomputer.
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The first
such desktop-size system specifically designed for personal use appeared in
1974; it was offered by Micro Instrumentation Telemetry Systems (MITS). The
owners of the system were then encouraged by the editor of a popular
technology magazine to create and sell a mail-order computer kit through the
magazine. The computer, which was called Altair, retailed for slightly less
than $400. |
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The demand
for the microcomputer kit was immediate, unexpected, and totally
overwhelming. Scores of small entrepreneurial companies responded to this
demand by producing computers for the new market. The first major electronics
firm to manufacture and sell personal computers, Tandy Corporation (Radio
Shack), introduced its model in 1977. It quickly dominated the field, because
of the combination of two attractive features: a keyboard and a cathode-ray
display terminal (CRT). It was also popular because it could be programmed
and the user was able to store information by means of cassette tape. Soon after Tandy's new model was
introduced, two engineer-programmers—Stephen Wozniak and Steven Jobs—started
a new computer manufacturing company named Apple Computers. |
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In 1976, in
what is now the |
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Some of the new features they
introduced into their own microcomputers were expanded memory, inexpensive
disk-drive programs and data storage, and color graphics. Apple Computers
went on to become the fastest-growing company in In 1981, IBM introduced its own
microcomputer model, the IBM PC. Although it did not make use of the most
recent computer technology, the PC was a milestone in this burgeoning field.
It proved that the microcomputer industry was more than a current fad, and
that the microcomputer was in fact a necessary tool for the business
community. The PC's use of a 16-bit microprocessor initiated the development
of faster and more powerful micros, and its use of an operating system that
was available to all other computer makers led to a de facto standardization
of the industry. In the mid-1980s, a number of other
developments were especially important for the growth of microcomputers. One
of these was the introduction of a powerful 32-bit computer capable of
running advanced multi-user operating systems at high speeds. This has dulled
the distinction between microcomputers and minicomputers, placing enough
computing power on an office desktop to serve all small businesses and most
medium-size businesses. Another innovation was the
introduction of simpler, "user-friendly" methods for controlling
the operations of microcomputers. By substituting a graphical user interface
(GUI) for the conventional operating system, computers such as the Apple
Macintosh allow the user to select icons—graphic symbols of computer
functions—from a display screen instead of requiring typed commands. Douglas Engelbart,
invented an "X-Y Position Indicator for a Display System": the
prototype of the computer "mouse" whose convenience has
revolutionized personal computing. New voice-controlled systems are now
available, and users may eventually be able to use the words and syntax of
spoken language to operate their microcomputers. |
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World Wide Web (WWW), system of resources that enable computer
users to view and interact with a variety of information, including magazine
archives, public- and university-library resources, current world and
business news, and software programs. The WWW can be accessed by a computer
connected to an internet, an interconnection of computer networks or through
the public Internet, the global consortium of interconnected computer
networks. |
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WWW resources are
organized to allow users to move easily from one resource to another. Users
generally navigate through the WWW using an application known as a WWW
browser client. The browser presents formatted text, images, sound, or other
objects, such as hyperlinks, in the form of a WWW page on a computer screen.
The user can click on a hyperlink with the cursor to navigate to other WWW
pages on the same source computer, or server, or on any other WWW server on
the network. The WWW links exist across the global Internet to form a
large-scale, distributed, multimedia knowledge base that relates words,
phrases, images, or other information. Smaller-scale implementations may
occur on enterprise internets. WWW pages are
formatted using Hypertext Markup Language (HTML), and information is
transferred among computers on the WWW using a set of rules known as
Hypertext Transfer Protocol (HTTP). Other features may be added to web pages
with special programs, such as Java, a programming language that is
independent of a computer's operating system, developed by Sun Microsystems.
Java-enabled web browsers use applets that run within the context of
HTML-formatted documents. With applets it is possible to add animation and
greater interactively to web pages. The World Wide Web
was developed in 1989 by English computer scientist Timothy Berners-Lee to
enable information to be shared among internationally dispersed teams of
researchers at the European Laboratory for Particle Physics (formerly known
by the acronym CERN) near |
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The Internet is a worldwide network of thousands of computers
and computer networks. It is a public, voluntary, and cooperative effort
between the connected institutions and is not owned or operated by any single
organization. The Internet and Transmission Control Protocols were initially
developed in 1973 by American computer scientist Vinton Cerf
as part of a project sponsored by the United States Department of Defense
Advanced Research Projects Agency (ARPA) and directed by American engineer
Robert Kahn. |
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The Internet began
as a computer network of ARPA (ARPAnet) that linked
computer networks at several universities and research laboratories in the "The DESIGN of
Internet was done in 1973 and published in 1974. There ensued about 10 years
of hard work, resulting in the roll out of Internet in 1983. Prior to that, a
number of demonstrations were made of the technology - such as the first
three-network interconnection demonstrated in November 1977 linking SATNET,
PRNET and ARPANET in a path leading from Menlo Park, CA to University College
London and back to USC/ISI in Marina del Rey,
CA." . - Vinton Cerf explains the timing: Internet,
interconnection of computer networks that enables connected machines to
communicate directly. The term popularly refers to a particular global
interconnection of government, education, and business computer networks that
is available to the public. There are also smaller internets, usually for the
private use of a single organization, called intranets. Internet technology
is a primitive precursor of the Information Superhighway, a theoretical goal
of computer communications to provide schools, libraries, businesses, and
homes universal access to quality information that will educate, inform, and
entertain. In early 1996, the Internet interconnected more than 25 million
computers in over 180 countries and continues to grow at a dramatic rate. How Internets Work Different types of
addressing formats are used by the various services provided by internets
(see Internet address). One format is known as dotted decimal, for example:
123.45.67.89. Another format describes the name of the destination computer
and other routing information, such as "machine.dept.univ.edu." The
suffix at the end of the internet address designates the type of organization
that owns the particular computer network, for example, educational institutions
(.edu), military locations (.mil), government
offices (.gov), and non-profit organizations
(.org). Networks outside the Once addressed, the
information leaves its home network through a gateway. It is routed from
gateway to gateway until it reaches the local network containing the
destination machine. Internets have no central control, that is, no single
computer directs the flow of information. This differentiates internets from
other types of online computer services, such as The Internet
Protocol Even though computer
interaction is in its infancy, it has dramatically changed our world,
bridging the barriers of time and distance, allowing people to share
information and work together. Evolution toward the Information Superhighway
will continue at an accelerating rate. Available content will grow rapidly,
making it easier to find any information on the Internet. New applications
will provide secure business transactions and new opportunities for commerce.
New technologies will increase the speed of information transfer, allowing
direct transfer of entertainment-on-demand. Broadcast television may be
replaced by unicast, in which each home receives a
signal especially tailored for what its residents want to see when they want
to see it |
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In 1936 British
mathematician Alan Turing proposed the idea of a machine that could process
equations without human direction. The machine (now known as a Turing
machine) resembled an automatic typewriter that used symbols for math and
logic instead of letters. Turing intended the device to be used as a
"universal machine" that could be programmed to duplicate the
function of any other existing machine. Turing's machine was the theoretical
precursor to the modern digital computer. In the 1930s American
mathematician Howard Aiken developed the Mark I calculating machine, which
was built by IBM. This electronic calculating machine used relays and
electromagnetic components to replace mechanical components. In later
machines, Aiken used vacuum tubes and solid state transistors (tiny
electrical switches) to manipulate the binary numbers. Aiken also introduced
computers to universities by establishing the first computer science program
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John Mauchley, an American physicist, and J. Presper Eckert, an American engineer, proposed an
electronic digital computer, called the Electronic Numerical Integrator And
Computer (ENIAC), which was built at the Moore School of Engineering at the |
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Roughly 2000 of the
computer's vacuum tubes were replaced each month by a team of six
technicians. Many of ENIAC's first tasks were for military purposes, such as
calculating ballistic firing tables and designing atomic weapons. Since ENIAC
was initially not a stored program machine, it had to be reprogrammed for
each task. Unfortunately,
although the conceptual design for EDVAC was completed by 1946, several key
members including Eckert and Mauchley left the
project to pursue their own careers, and the machine did not become fully
operational until 1952. When it was finally completed, EDVAC contained
approximately 4,000 vacuum tubes and 10,000 crystal diodes. In light of its late
completion, some would dispute EDVAC's
claim-to-fame as the first stored-program computer. A small experimental
machine (which was based on the EDVAC concept) consisting of 32 words of
memory and a 5-instruction instruction set was operating at EDSAC contained 3,000
vacuum tubes and used mercury delay lines for memory.Programs
were input using paper tape and output results were passed to a teleprinter. Additionally, EDSAC is credited as using one
of the first assemblers called "Initial Orders," which allowed it
to be programmed symbolically instead of using machine code. Eckert and Mauchley eventually formed
their own company, which was then bought by the Rand Corporation. They
produced the Universal Automatic Computer (UNIVAC), which was used for a
broader variety of commercial applications. The (UNIVAC I), was also based on
the EDVAC design. Work started on UNIVAC I in 1948, and the first unit was
delivered in 1951, which therefore predates EDVAC's
becoming fully operational. Eckert and Mauchly later lost the patent on their machine when it
was claimed that another early experimenter, John Atanasoff,
had given them all the ideas about ENIAC that mattered. |
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