Happy birthday to Marie-Anne Paulze Lavoisier (1758 – 1836) who worked closely with her husband Antoine in the lab, modernizing and quantifying #chemistry and the scientific method, recognized and named oxygen and hydrogen, explained the role that oxygen plays in combustion, helped modernize chemical nomenclature and discovered that mass is conserved in chemical reactions. Traditionally Antoine has been called the "father of modern chemistry" (with little to no mention of his wife)