As NASA fought to catch up to the Soviet Union in the space race, they selected a Navy veteran as the first astronaut. But what happened once Alan Shepard stepped into the space capsule? Alan Shepard ...

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Scientists are sharpening their forecasts for how long Earth can remain a comfortable home for complex organisms, and the latest work points to a much earlier cutoff than the classic textbook ...

The first animals to inhabit the Earth may have been sea sponges, a new study by geochemists from the Massachusetts Institute of Technology (MIT) has suggested. In their work, the researchers linked ...