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lunar map

SCARRED SURFACE  The moon held on to almost all the craters it’s ever acquired in 4.5 billion years of impacts. This lunar map is surrounded by images of 111 craters wider than 10 kilometers and younger than a billion years.

Aedes aegypti mosquito

SKEETER STYMIED  The Aedes aegypti mosquito can transmit viral diseases like Zika and dengue. Molecules produced by an insect-killing bacteria appear to keep these mosquitoes at bay as effectively as DEET.

Sehuencas water frog

CHYTRID SURVIVOR  After a decade in which people feared they were extinct, five Sehuencas water frogs have been discovered in Bolivia, including this female named Juliet. Researchers plan to introduce her to Romeo, a frog in captivity that until now was the last known survivor of his species.

tetrapod robot

ROAMING BOT  Researchers designed a robot called OroBOT to re-create and analyze different gaits that Orobates pabsti, a four-legged creature that lived about 290 million years ago, might have used.

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