It took early “humans” 110,000 generations of using stone tools before controlling fire, another 20,000 generations until written language was invented, and only another 250 generations until we put a man on the moon. In 2 or 3 generations, humans went from barely having electricity, to having the Internet. And in a single generation went from slow mainframe computers to the incredible smart phones of today.
from Crazy Facts http://ift.tt/1pvI9hA
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