Tracy Caldwell Dyson, American chemist and astronaut

Tracy Caldwell Dyson is an American chemist and NASA astronaut. She was a mission specialist on Space Shuttle Endeavour flight STS-118 in August 2007 and has participated in two long-duration missions to the International Space Station, Expedition 23 and 24 from April to September 2010 and Expedition 70 and 71 from March to September 2024. She has completed four spacewalks, logging nearly 24 hours of extravehicular activity.

August 14 is the 226th day of the year in the Gregorian calendar; 139 days remain until the end of the year.