Space travel might fry your brain, causing permanent learning and memory problems
(PHYSorg.com Space & Earth)

During the course of a deep space mission, astronauts are routinely in various degrees of peril. Depending on which Hollywood sci-fi thrillers you choose, these intrepid explorers are at the mercy of malicious aliens, psychotic computers, or collisions with asteroids or space debris. While these might all be possible concerns, remote or otherwise, the greatest real danger to astronauts may in fact be one that cannot be seen: space radiation.