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Life & Evolution

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sea slugs

HITCHHIKERS  These marine sea slugs stowed away on a derelict vessel from Iwate Prefecture in Japan before being washed ashore in Oregon in April 2015. 

Schmidtea mediterranea

DANGER DETECTOR  In planarians (Schmidtea mediterranea shown), a protein called TRPA1 detects hydrogen peroxide, a molecule produced when cells are damaged. These new results give hints about the evolution of human pain.

La Brea Tar Pits

STICKY SITUATION  At the La Brea Tar Pits in today’s Los Angeles, mastodons, dire wolves, saber-toothed cats and thousands of other creatures — prey and predators — were trapped and later excavated.

Life & Evolution

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