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Facing Reality About Life on Other Planets, 6: Chemistry and Probability

In this final segment about habitability of exoplanets, Dr Henry Richter looks at chemistry and probability.

Crinoid Pigment: 240 Million Years and No Evolution

Pigments from crinoids fossilized in early Mesozoic strata are identical to modern counterparts.

Without Bromine, There Would Be No Animals

A 28th element has proven to be essential for life: bromine.
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