Word: heart
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Dates: during 1990-1999
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...Edwin Armstrong develops superheterodyne circuit, the receiver-amplifier at the heart of radios and televisions today...
Godel's 1931 article did something else: it invented the theory of recursive functions, which today is the basis of a powerful theory of computing. Indeed, at the heart of Godel's article lies what can be seen as an elaborate computer program for producing M.P. numbers, and this "program" is written in a formalism that strongly resembles the programming language Lisp, which wasn't invented until nearly 30 years later...
Though others had been warning of pesticide dangers, it was Carson who struck upon the metaphor that would draw all these dire warnings to a point. "There was once a town in the heart of America where all life seemed to live in harmony with its surroundings...Then a strange blight crept over the area and everything began to change...There was a strange stillness...The few birds seen anywhere were moribund; they trembled violently and could not fly. It was a spring without voices. On the mornings that had once throbbed with the dawn chorus of scores of bird...
...South African surgeon Christiaan Barnard performs the first successful human-heart transplant; his patient, Louis Washkansky, survives 18 days...
...Surgeons at the University of Utah Medical Center, led by William DeVries, replace Barney Clark's failing heart with a mechanical one designed by Robert Jarvik; Clark dies 112 days later...