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The Intel 4004 was the first programmable microprocessor which controls all functions of the CPU, or central processing unit, of a computer or another digital device. Very important in this day and age.
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A text based messaging between computers through the ARPANET using the "@" symbol to route messages. We use this all the time, if not every day to communicate.
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The first mobile phone. This is something that almost everyone has and could almost not live without in today's world.
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The first Digital Camera was invented by Steven Sasson while working at Eastman Kodak. We use digital cameras almost every day.
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A portable cassette player with buttons, headphones, and a leather case. This was before Cd's and MP3 players were invented, but helped into the portability of technology.