From Twitter https://twitter.com/: Maria Mitchell, the first American woman to work as a professional astronomer, born #onthisday in 1818 https://www.space.com/34709-maria-mitchell-astronomer-feminist.html?utm_source=hootsuite&utm_medium=social&utm_campaign=standard #womeninstem https://twitter.com/royalsociety/status/892288824574976000/photo/1 https://chirp.cooleysekula.net/attachment/37916