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A Forever Stamp and a Discovery That Changed Physics Forever

Credit: ©2021 U.S. Postal Service. All rights reserved. With a new “forever” stamp honoring First Lady of Physics Chien-Shiung Wu, we have come very close to seeing a National Institute of Standards and Technology (NIST) researcher on a U.S. postage stamp. Over the course of six months in 1956, Wu worked with researchers Ernest Ambler (who went on to become NIST director in the 1970s and ’80s), Raymond W. Hayward, Dale D. Hoppes and Ralph P. Hudson to carry out one of the most famous  experiments in NIST’s history. Of course, NIST researchers have been up to many good things since then, but the Fall of Parity experiment carried out in collaboration with Wu still ranks high. The team’s findings, made in the quiet week after Christmas 1956, shattered a concept of nuclear physics that had been universally accepted for 30 years.

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