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Did Earth Get Its Water from Meteor Squirt Guns?

You can't just fire bullets at pumice and claim that Earth got its oceans that way.

Radiation, Mistakes, and Assumptions

Three news items about atomic radiation should cause us to beware of academic overstatement.

"Fundamental Assumption" in Zircon Dating Called into Question

A commonly-used dating method has been threatened by new findings that undermine assumptions.

Of Molecules and Men

Atoms and molecules are tiny but can have a big influence on the habitability of planets and astrobiologists' theories about them.
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