Word: googol
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Dates: during 1930-1939
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...rainy day, the scientist got the children to agree that the number was approximately equal to the number of sand grains at Coney Island. One followed by 20 zeros was a satisfactory expression. Dr. Kasner then proposed a greater number, one of his own, which he called a "googol": 1 followed by 100 zeros. He also proposed a much greater number still, a "googol plex": 1 followed by a googol of zeros...
Nevertheless, the improbability of some events possible in theoretical physics is so great that a number somewhere be tween a googol and a googolplex would be required to express it. However, Dr. Kasner points out that no number is anywhere near infinity so long as it can actually or theoretically be written...