Three and a half billion years of evolution have produced uncountable billions of living species. But only one - humans-can think in symbols; recombine those symbols into infinite meanings; invent a technology to disseminate the message; worry how others might react to it; ponder the past; speculate about the future; and imagine the unknown. 'The Human Spark' follows Alan Alda as he explores our uniquely human brains and tackles the differences between us, our extinct Neanderthal cousins, and modern chimps.
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