Space travel is pretty impressive stuff, isn't it? What, with all the rocket science and that zero-gravity stuff. Blah, blah, blah -- boooorrrring!
Who cares about that? What people really want to know about space travel is how astronauts go to the bathroom aboard the Space Shuttle.
Believe it or not, it's just as intricate as space travel itself.
So finally, there's a YouTube video to explain it all.