So it seems that evolution can happen pretty quickly, too. A research team has found that a couple of DNA mutations about 500 million years ago made a whole lot of difference in our hormone composition, without which things like pregnancy, puberty, and kidney function would not be what they are: http://www.sciencedaily.com/releases/2013/06/130624152617.htm
The phrase "the Great Leap Forward" actually was used most (in)famously by China's Mao Zedong to describe his five-year plan (1958-1963) to modernize China, starting with industry and agriculture. It was a colossal failure, and between 1959 and 1962, it is estimated, about 20 million people died of starvation: http://www.historylearningsite.co.uk/great_leap_forward.htm
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