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We've known for a long time.
Where are you the lightest?
It's more than you can imagine.
There are a few competing theories.
Goldilocks, eat your heart out.
Paging Jules Verne ...
That frozen wasteland was once a lush paradise.
Geology's got nothing to do with it.
Researchers will chase it in jets, watch animals freak out, and measure practically everything.
The answer tells us something about earthquakes.