Memorizing seven continents feels settled, like learning the alphabet. A new study argues the ground rules are less tidy.
"We're not saying, and we can't say, that there's no life in Europa. What we're saying is that it's a harder proposition, ...
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Earth's evolution over a billion years
Watch the Earth's tectonic plates grow, shrink, and jostle for position in this new model of the last billion years on the ...
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