Tech. Sgt. Steven Blake, a member of the Air Force Technical Applications Center at Patrick AFB, Fla., pours liquid nitrogen into a bowl to freeze balloons to illustrate to local school students how the difference in temperatures changes malleable objects into brittle ones during the 2020 Women in Science and Engineering Symposium Jan. 21-23, 2020. (U.S. Air Force photo by Matthew S. Jurgens)
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