Word: zircons
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Dates: during 2000-2009
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...gems go, it wasn't much, just a dustlike grain of zircon. But the tiny crystal put a gleam in scientific eyes last week. Some 400 million years older than any previously discovered terrestrial rock, it could rewrite Earth's history--upsetting the timetable for the appearance of oceans and continents, challenging ideas about the formation of the moon and, most important, pushing back by several hundred million years the genesis of life...