Here's our favorite astronaut and yours, Cmdr. Chris Hadfield, giving a simple, English language version of how going to the bathroom is complicated by being in space, the, ahem, dangers inherent in introducing poop to zero gravity environments. You might already know this stuff, or you might not, but Hadfield makes it as fun and informative and, erm, digestible as you could ask for. [Laughing Squid]