San Francisco’s big 1906 earthquake was third of a series on...

Geophysicist teams with mathematicians to describe how river rocks round

Dolomite

End-Permian extinction happened in 60,000 years—much faster than earlier estimates, study...

Dioptase

Angara River

Researchers Uncover New Species of Prehistoric Reptile

The dinosaurs’ demise up close

‘Steak-knife’ teeth reveal ecology of oldest land predators

Substance in photosynthesis was in play in ancient, methane-producing microbes

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