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cover of May 30, 2015 issue

Earth & Sky

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The opah is the fish closest to the whole-body warm-bloodedness typical of mammals and birds. This trait may give the species an edge in the ocean’s cold depths.

This opah is about as close to a full-body warm-blooded fish as science has yet discovered. Here, biologist Nick Wegner prepares to insert a temperture sensor into the animal’s pectoral muscles. The device will record internal and external temperatures following the fish’s release.

Dana Arabiyat, 15, of Amman, Jordan, designed a satellite (model shown) to collect and dispose of the space trash that threatens other satellites orbiting Earth.

Dana Arabiyat, 15, of Amman, Jordan, designed a satellite (model shown) to collect and dispose of the space trash that threatens other satellites orbiting Earth.

Scientists measure carbon in sediment cores drilled from the ocean floor. These cores show that extra carbon is being added to the atmosphere at a rate unmatched in 66 million years. Not even a massive outpouring of carbon 56 million years ago (the red band) comes close, a new study finds.

Scientists measure carbon in sediment cores (seen here) drilled from the ocean floor. These cores show that extra carbon is being added to the atmosphere at a rate unmatched in 66 million years. Not even a massive outpouring of carbon 56 million years ago (the red band) comes close, a new study finds.

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