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Mars Life Hopes Reduced

Key assumptions about habitability on Mars have fallen, but astrobiologists try to keep hope alive.

Precambrian Protein Identified

They say it's almost two billion (with a B) years old, yet it resembles modern counterparts.

Crinoid Pigment: 240 Million Years and No Evolution

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

Left-Handed Life: Is the Chirality Problem Near Solution?

Cells use only left-handed amino acids and right-handed sugars. A new hypothesis involving the weak nuclear force tries to address this asymmetry.
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