When historians start to suss out the people who had the biggest global impact of the 20^th century, Marty Cooper may well be among the frontrunners.

Forty years ago today, Cooper made the first call ever on a portable cellular phone, a device he and his team at Motorola had just completed. (That call, ironically, was to the head of the research department at rival Bell Labs, which was racing Motorola to invent the technology.)

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