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I was reading about how countless species are being pushed toward extinction by man's destruction of forests. Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us. Calvin and Hobbes are walking in the woods. Calvin says he was reading how countless species are being pushed toward extinction by man's destruction of forests. Calvin continues by saying the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.