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Here are some technology predictions that proved to be completely wrong. It is a good thing that pessimists and doubters don't always have the last word. Sources:

The internet is going to collapse
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"I predict the Internet will soon go spectacularly supernova and in 1996 catastrophically collapse."

Robert Metcalfe, inventor of Ethernet


World market for computers: 5
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"I think there is a world market for maybe five computers.”

–Thomas Watson, chairman of IBM, 1943


Communication satellites are worthless
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“There is practically no chance communications space satellites will be used to provide better telephone, telegraph, television, or radio service inside the United States.”

T. Craven, FCC Commissioner, in 1961


Computers will only weigh 1.5 tons
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"Computers in the future may weigh no more than 1.5 tons.”

–Popular Mechanics, forecasting the relentless march of science, 1949


That is the weight of an average hippopotamus.

Home computers are worthless
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“There is no reason anyone would want a computer in their home.”

–Ken Olson, president, chairman and founder of Digital Equipment Corp., 1977

iMac is doomed
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"The iMac will only sell to some of the true believers. [It's] clean, elegant, floppy-free—and doomed."

The Boston Globe, May 14, 1998


The telephone is not a serious form of comunication
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“This ‘telephone’ has too many shortcomings to be seriously considered as a means of communication. The device is inherently of no value to us.”

–Western Union internal memo, 1876.


Nuclear-powered vacuum cleaners
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“Nuclear-powered vacuum cleaners will probably be a reality in 10 years.”

Alex Lewyt, president of vacuum cleaner company Lewyt Corp., in the New York Times in 1955.


Television won't capture any market
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“[Television] won’t be able to hold on to any market it captures after the first six months. People will soon get tired of staring at a plywood box every night.”

Darryl Zanuck, movie producer, 20th Century Fox, 1946.


Spam will be history
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"Two years from now, spam will be solved."

World Economic Forum, 2004: Bill Gates