Google's computer program AlphaGo on Thursday defeated Lee Sedol, the world champion of the ancient Chinese board game Go, once again in the second game of a historic five- game match.
The result stunned the world, fueling an upsurge of interest as well as concerns over such questions as: will the brain of the computer eventually outsmart that of humans? Will artificial intelligence (AI) replace humans one day?
Let's take a look at the games between human and computer in the past 20 years.
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