![]() The purpose of this paper is to explain how Kaplan-Meier curves are generated and analyzed. Kaplan-Meier analyses are also used in non-medical disciplines. “Survival” times need not relate to actual survival with death being the event the “event” may be any event of interest. Subsequently, the Kaplan-Meier curves and estimates of survival data have become a familiar way of dealing with differing survival times (times-to-event), especially when not all the subjects continue in the study. Kaplan and Paul Meier collaborated to publish a seminal paper on how to deal with incomplete observations. Astronauts use the vacuum to "catch" floating objects that are out of their reach.In 1958, Edward L. They also use it to keep dust out of the air filters. These parts can clean areas that may be hard to reach. The hose helps move bad smells away from the astronauts.Īstronauts must use a vacuum cleaner in space. Then it is moved far away from the astronauts. Each trash container has a trash liner placed inside. Wet trash is anything that could smell bad. Three are for dry trash and one is for wet trash. There are four trash bins on the Space Shuttle. They use the same kind of wipes and cleanser on their forks, spoons, and eating trays.Īstronauts have to take out the garbage, too. The astronauts also use wet wipes to wash things. In space, the astronauts wipe the walls, floors, and windows to keep them clean. They have to keep their area clean in space just like we do on Earth. In space, astronauts live in a very small space. But we have to keep our rooms and houses clean and neat. Patients who cannot get in the water use these soaps.ĭoing chores is not always a fun thing. These special soaps and shampoos were made for hospitals. After washing, they use a towel to dry off. They do not let the soap bubbles go all over the place. Astronauts use special kinds of soap and shampoo. People take baths a different way in space, too. ![]() Astronauts have to spit into a washcloth. There is no sink like yours on the Space Shuttle, though. These are kept in a Personal Hygiene Kit.Īstronauts use toothpaste and toothbrushes just like yours. But, they do have their own toothbrushes, toothpaste, combs, brushes, and shavers. In space, the astronauts do not have a bathroom as we have at home. In space, astronauts need to stay clean, too. Image above: An astronaut brushes his teeth while in space The astronauts have to rest so their bodies have time to make new blood and water. It takes their bodies a few days to make more blood and water. When the astronauts come back to Earth, they do not have enough fluids in their systems. The brain thinks that there are too many fluids. These fluids move from the bottom of the body to the top. The blood and water are fluids in the body. It makes the astronauts' faces look puffy. Water in the body also does the same thing. In space, without the pull of gravity, the blood moves to the upper body and head. The heart has to work extra hard against gravity to move the blood all around the body. When we stand up on Earth, blood goes to our legs. ![]() The heart and blood change in space, too. So, how do astronauts help their muscles and bones? They must exercise in space every day. Their lower backs begin to lose strength. This helps keep our bones and muscles strong. On Earth, our lower body and legs carry our weight. Living in space is not the same as living on Earth. Image above: An astronaut walks on a treadmill to stay strong and healthy Learn how astronauts stay strong, clean and neat. The way we stay clean and neat is different too. ![]() ![]()
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