Just like you conduct experiments in your science class, astronauts do experiments while in space. The zero gravity of space allows astronauts to carry out experiments that would not be possible in the gravity of Earth. There are more than 300 experiments currently happening aboard the International Space Station (ISS).
Baker, a squirrel monkey, perches on a model of the Jupiter missile that launched her into space on a sub-orbital flight, along with a rhesus monkey named Able, on May 28, 1959 - fifty years ago. Fruit fly larva and sea urchin eggs also accompanied Able and Baker, who both survived the flight; Able, though, died four days after the flight from a reaction to the anesthetic given during surgery to remove an electrode.