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Life & Evolution

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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.

illustration of Orbiting Carbon Observatory-2

LOFTY LOOK  NASA’s Orbiting Carbon Observatory-2 (shown in an artist’s illustration) launched in 2014 and is giving scientists an unprecedented peek into how carbon moves between land, atmosphere, and oceans on Earth.

Life & Evolution

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