Tracy Caldwell Dyson (born Tracy Ellen Caldwell, August 14, 1969) is an American chemist and NASA astronaut. Caldwell Dyson was a Mission Specialist on Space Shuttle Endeavour flight STS-118 in August 2007. She was part of the Expedition 24 crew on the International Space Station between April 4, 2010 and September 25, 2010. She has completed three spacewalks, logging more than 22 hrs of EVA including work to replace a malfunctioning coolant pump.
Read more about Tracy Caldwell Dyson: Academic Career, NASA Career, Personal Life, Education, Organizations, Awards and Honors, References
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“Mrs. Zajac knows you didn’t try. You don’t just hand in junk to Mrs. Zajac. She’s been teaching an awful lot of years. She didn’t fall off the turnip cart yesterday. She told you she was an old-lady teacher.”
—Christine Zajac, U.S. fifth-grade teacher. As quoted in Among Schoolchildren, “September” section, part 1, by Tracy Kidder (1989)
“The Government of the absolute majority instead of the Government of the people is but the Government of the strongest interests; and when not efficiently checked, it is the most tyrannical and oppressive that can be devised.”
—John Caldwell Calhoun (1782–1850)
“The question that will decide our destiny is not whether we shall expand into space. It is: shall we be one species or a million? A million species will not exhaust the ecological niches that are awaiting the arrival of intelligence.”
—Freeman Dyson (b. 1923)