Perhaps it comes in the shape of a nuclear war, or a new virus—deadlier than AIDS and more infectious than the common cold—or a collision with a huge meteorite. Whatever the cause, imagine that Homo sapiens suddenly passes into history. It's a shocking scenario, but perfectly plausible—witness the demise of the dinosaurs 65 million years ago. What kind of legacy would we leave behind? Today, we are rulers of the planet. A hundred million years from now, will we just be history, or geology and palaeontology too?
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