Spacelab experiments. Astronauts Donald Thomas (right) and Gregory Linteris conduct microgravity experiments in the Spacelab module aboard the shuttle Columbia. Thomas is using the Expedite the Processing of Experiments to Space Station" (EXPRESS) rack which carries small experiments. It is intended to be used on the proposed international space station. Linteris is using the Mid Deck Glove Box (MGBX) which offers physical isolation from the rest of the Spacelab, and is equipped with photographic, video, and data recording equipment to allow a complete record of experiments. Photographed during mission STS-83 (4-8 April 1997)."