17. The spacewalks can cause astronauts’ fingernails to fall off due to the current glove design.
18. U.S. and Russian astronauts on the ISS have separate water supplies. While the U.S. water uses iodine for bacteria control, the Russian water uses silver. If these substances mix, a silver-iodine precipitate forms in the water, which may clog the sublimator in the NASA EMU spacesuit.
19. Astronauts must have good airflow around them when they sleep, otherwise they, “…could wake up oxygen-deprived and gasping for air, because a bubble of their own exhaled carbon dioxide had formed around their heads.”