Mars 2020 rover gets its wheels

In this image, taken on June 13, 2019, engineers at NASA's Jet Propulsion Laboratory in Pasadena, California, install the starboard legs and wheels—otherwise known as the mobility suspension—on the Mars 2020 rover. They ...

Ancient four-legged whales once roamed land and sea

Whales belong in the ocean, right? That may be true today, but cetaceans (whales, dolphins, porpoises) actually descended from four legged mammals that once lived on land. New research published in Current Biology reports ...

Resting postures determined by animals' size

Cows always rest on their chests so that their digestion is not impaired. Rodents sometimes rest sitting down, while kangaroos sometimes lie on their backs. The larger the animal, the less often it lies down, and when it ...

Paleontologists report world's biggest Tyrannosaurus rex

University of Alberta paleontologists have just reported the world's biggest Tyrannosaurus rex and the largest dinosaur skeleton ever found in Canada. The 13-metre-long T. rex, nicknamed "Scotty," lived in prehistoric Saskatchewan ...

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