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WASHINGTON — In celebration of its 50th anniversary, NASA will premiere the documentary “50 Years of Exploration: The Golden Anniversary of NASA” on NASA Television’s Public and Education channels ...

They sound like characters from a new Marvel movie, but these “Planetary Defenders” are real-life scientists in Tucson and elsewhere who are working to save the world from a major asteroid impact.

Ella al-Shamahi is the perfect guide to our ancient ancestors. In Human, she takes us on a whistle-stop tour of our past over a span of 300,000 years, including our turbulent relations with other ...