Let’s talk about pee: on the International Space Station (ISS), using the bathroom is similar to down here, but the toilets suck liquid and solid waste into special containers before dispersing it. Astronauts on the ISS follow intense work schedules and must rest for at least 8 hours a day.

A space toilet, or zero-gravity toilet, is designed for use in a weightless environment. In the absence of gravity, the collection and retention of liquid and solid waste are managed using airflow. Since the air used to direct the waste is returned to the cabin, it is filtered beforehand to control odor and eliminate bacteria. More modern systems expose solid waste to vacuum pressures to kill bacteria, preventing odor problems and eliminating pathogens.

Crew members use a specially shaped funnel and hose for urine and a seat for bowel movements. The funnel and seat can be used simultaneously, reflecting feedback from female astronauts. Although the space toilet seat may look uncomfortably small and pointy, it is ideal in microgravity. It provides optimal body contact to ensure everything goes where it should.