The Human Brain
The human brain has about 100 billion neurons. With an estimated average of one thousand connections between each neuron and its neighbors, we have about 100 trillion connections, each capable of a simultaneous calculation … (but) only 200 calculations per second…. With 100 trillion connections, each computing at 200 calculations per second, we get 20 million billion calculations per second. This is a conservatively high estimate…. In 1997, $2,000 of neural computer chips using only modest parallel processing could perform around 2 billion calculations per second…. This capacity will double every twelve months. Thus by the year 2020, it will have doubled about twenty-three times, resulting in a speed of about 20 million billion neural connection calculations per second, which is equal to the human brain.
(I think he was off by a few years! ~Otis)
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