New NASA astronauts graduate, eying moon—and Mars

After two years of rigorous training, ten Americans officially became astronauts on Tuesday, and are now eligible for planned NASA missions to the International Space Station, the moon, and—if all goes well—to Mars.

African savanna antelopes need space to survive climate changes

Human-caused environmental changes threaten natural ecosystems. These ecosystems are essential to creating and maintaining a rich, resilient, and adaptable biosphere. In East Africa's savanna, antelope populations are vital ...

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