Ida Freund, Austrian-born chemist and educator (died 1914)

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.

April 15 is the 105th day of the year in the Gregorian calendar; 260 days remain until the end of the year.