Ikuro Teshima

Watched on television the space walk of an American astronaut who performed the docking and repairs of spacecrafts while swimming in the bottomless space outside of his satellite. It was truly an amazing scene.

On the earth's surface we can easily walk without any fear, but in the water it is not so easy for everyone to swim or float; for those who cannot swim it is even frightful to be in the water. However, with a little practice we can float on our backs. The technique of floating is to relax the body; when we relax our muscles and try to be like a corpse, we suddenly have buoyancy and we float. But if we strain our muscles, we sink in the water.

Then, how is it possible for a man to swim in a vacuum where there is no air nor anything else?