Ida Freund, Austrian-born chemist and educator (born 1863)

Ida Freund was the first woman to be a university chemistry lecturer in the United Kingdom. She is known for her influence on science teaching, particularly the teaching of women and girls. She wrote two key chemistry textbooks and invented the idea of baking periodic table cupcakes, as well as inventing a gas measuring tube, which was named after her.

May 15 is the 135th day of the year in the Gregorian calendar; 230 days remain until the end of the year.