William Schopf, paleobiologist, John Valley, geoscientist: As humans, it’s difficult to take the long view of history because we’re the new kids on the block, having only been around 3 million years or so. Although you may feel old by the time you’re an adult, the reality is that people are a recent development. The first life forms existed long before our arrival, now confirmed as some 3.5 billion years ago.
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