NASA astronaut Ed White was the first American to walk in space during the Gemini IV mission on June 3, 1965.
Space poses challenges like lower gravity, higher radiation, and lack of ER access; an astronaut scientist discusses spaceflight's impact on the human body.
Telomeres, structures on the tips of chromosomes, change in outer space, explored in NPR's Space Camp series on space's weird aspects.
For more space science, listen to Short Wave on Spotify or Apple Podcasts, and support NPR's sponsor-free Short Wave+ program.
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