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The Cell Phone is 40

It was 40 years ago (April 3, 1973) when Martin Cooper made his first call
from his new Motorola DynaTAC cell phone.
I wonder if he knew he was doing something that would change the world.
Cell phones have come a long way in the last four decades.  They have gone
from very bulky simple devices to some of the most sophisticated electronic
devices in the world.  And it fits in the palm of your hand.  It’s actually quite
difficult to think of a world without them.