On going to the bathroom
MK: It's hard, you know. Everyone's peeing into a funnel, with suction, even women. Your gastrointestinal system takes a while to adjust to space. It's almost like your whole gut shuts down; physiologically it's one of my biggest challenges in space, as it is with a lot of people.
For #2, we have a toilet with airflow, and a vacuum in it. It's kind of like a regular toilet, but it has a lot of switches. You need to turn it on and there's a slider that goes across the hole—which isn't very big, so you have to have good aim. We actually have a trainer at NASA that even has a camera on the bottom of a practice toilet, so you can practice how to position yourself. Which is not a view of yourself you'd ever think you would see.