56 years ago today, December 5, 1969 (October 26, 1969 in the lunar calendar), British physicist Cecil Frank Powell was born. Cecil Frank Powell (December 5, 1903-August 9, 1969) was born in Kent, England, and died on Lake Como, Italy. He was a British physicist. In 1947, Powell published a paper on the use of photographic techniques to discover ¦Ð mesons, together with Giuseppe Osirini, H.Muirhead, and the young Brazilian physicist César Lattes. For this purpose, he was awarded the Nobel Prize in Physics in 1950. It was later proved that the ¦Ð meson was a subatomic particle predicted by Hideki Yukawa in his theory of nuclear physics in 1935. In 1955, Powell participated in the signing of the Russell-Einstein Manifesto. Comment: A great physicist.