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STS-94 Mission Specialist Donald A. Thomas  smiles as a suit technician helps him into his launch/entry suit in the Operations and  Checkout (O&C) Building. He has flown on STS-83, STS-70 and STS-65. He holds a  doctorate in materials science and has been the Principal Investigator for a Space Shuttle  crystal growth experiment. Because of his background in materials science, Thomas will  be concentrating his efforts during the Red shift on the five experiments in this discipline  in the Large Isothermal Furnace. He also will work on  the ten materials science  investigations in the Electromagnetic Containerless Processing Facility and four that will  be measuring the effects of  microgravity and motion in the orbiter on the experiments.  Thomas and six fellow crew members will shortly depart  the O&C and head for Launch  Pad 39A, where the  Space Shuttle Columbia will lift off  during a launch window that  opens at 1:50 p.m. EDT, July 1. The launch window was opened 47 minutes early to  improve the opportunity to lift off before Florida summer rain showers reached the space  center

STS-94 Mission Specialist Donald A. Thomas smiles as a suit technician helps him into his launch/entry suit in the Operations and Checkout (O&C) Building. He has flown on STS-83, STS-70 and STS-65. He holds a doctorate in materials science and has been the Principal Investigator for a Space Shuttle crystal growth experiment. Because of his background in materials science, Thomas will be concentrating his efforts during the Red shift on the five experiments in this discipline in the Large Isothermal Furnace. He also will work on the ten materials science investigations in the Electromagnetic Containerless Processing Facility and four that will be measuring the effects of microgravity and motion in the orbiter on the experiments. Thomas and six fellow crew members will shortly depart the O&C and head for Launch Pad 39A, where the Space Shuttle Columbia will lift off during a launch window that opens at 1:50 p.m. EDT, July 1. The launch window was opened 47 minutes early to improve the opportunity to lift off before Florida summer rain showers reached the space center