Borrowing nature's blueprint: Scientists replicate bone marrow
Hidden within our bones, marrow sustains life by producing billions of blood cells daily, from oxygen-carrying red cells to ...
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Sunita Williams & Butch Wilmore, NASA's 2 stuck astronauts take their first spacewalk together (WATCH)
Two NASA astronauts, left stranded aboard the International Space Station (ISS) after their spacecraft was deemed unfit for ...