Happy birthday to Katsuko Saruhashi! She became the first woman to receive a chemistry PhD in Japan and her work remains crucial to oceanographers working today. #WomensHistoryMonth . . . . . . . . . #women #womeninscience #WomenInSTEM #birthday #hbd #happybirthday #onthisday #otd #phd #firsts #firstwoman #chem #chemistry #japan #ocean #oceanographer