The human brain, which is suspended in clear cerebrospinal fluid inside the skull, can also be impacted by the effects of microgravity - in a surprisingly tangible way. As detailed in a new study published by an international team of researchers in the journal PNAS, the brain "shifts upward and backward within the skull following spaceflight, with sensory and motor regions exhibiting the largest shifts."
In the vacuum of space, the amount of debris-spent rocket stages, splintered satellites, micrometeoroids- numbers in the millions, all zooming about, often at 17,000 mph speeds. They're also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn't completely clean.
On May 5, 1961, Alan Shepard became the first American in space. However, three months earlier NASA had launched "Number 65" on a mission that helped pave the way for Shephard's momentous flight. Number 65 was a male chimpanzee born in 1957 in the French Cameroons in West Africa. After being captured by trappers, he was sent to a rare bird farm in Florida.