Even the world’s brightest and bravest are titillated by turd. Astronauts mentally and physically prepare for any obstacle that can come their way while soaring through space — including funneling their feces into a tube.

Add Yahoo as a preferred source to see more of our stories on Google. Whether you use a hole in the ground or a fancy gold-plated toilet, on Earth, gravity pulls your waste down and away from you. For astronauts, “doing their duty” is a bit more ...