From mcnees https://twitter.com/mcnees on Twitter: Physicist Marietta Blau was born #OTD in 1894. She pioneered the use of nuclear emulsion plates for particle detection, and discovered "disintegration stars" produced by cosmic rays interacting with nuclei in the plates. Photo: Agnes Rodhe https://twitter.com/mcnees/status/1387778911107534856/photo/1 https://chirp.cooleysekula.net/attachment/71831