This is a design that can prevent water in human body go up while in space. In human's body, 60% of the factor is water. Without gravity, water in astronauts' body will flow into their head. This can make the astronauts' head with too much pressure and also can cause their legs atrophy. The design can help the astronauts avoid the problems mentioned above. The Water Reservoir have a sphere in the middle that can help the human body preserve water.