This is the bathroom of the Space Shuttle Columbia. In the center of the picture, the toilet bowl and the urine funnel -- gray tube -- are visible. The astronauts have to position themselves on the toilet seat, using leg-restraints and thigh-bars. The toilet basically works like a vacuum cleaner with fans that suck air and waste into the commode. Each astronaut has a personal urinal funnel, which has to be attached to the hose's adapter. Fans suck air and urine through the funnel and hose into the wastewater tank.