• To ensure astronauts don’t float around while sleeping, they sleep in small private compartments and in sleeping bags strapped to the wall.
  • The ISS is so fast that it goes around Earth about every 90 minutes, which means astronauts see about 16 sunrises and 16 sunsets in one day. 
  • Showering every day is not a possibility in outer space. So instead, astronauts use wet towels, no-rinse soap, and special shampoo. 
  • Drinking water is recycled, even from moisture in the air and urine, to save supplies. 
  • In low gravity, an astronaut’s spinal discs can expand, making them up to 3% taller (about 5 to 7 cm) on the ISS. However, they return to their original height upon returning to Earth.
  • In 2001, Pizza Hut actually paid a Russian cosmonaut, Yuri Usachov, to deliver a specially preserved 6-inch salami pizza to the ISS, making it one of the most expensive deliveries and the first commercial pizza eaten in outer space.