1985 - William Cumming Rose died.

Rose was an American biochemist who discovered the amino acid threonine and its role in nutrition. He established ten amino acids: : arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine were vital human health.

1898 - Hieronymus Theodor Richter died.

U.S. Geological Survey

Richter was a German chemist who co-discovered the element indiumwith Ferdinand Reich. They were investigating the presence of thallium in zinc ores using spectroscopy when Richter discovered a vivid indigo spectral line that identified a new element. They isolated this element and named it indium after the spectral line.

1866 - Thomas Hunt Morgan was born.

Wikimedia Commons

Morgan was an American geneticist who was awarded the 1933 Nobel Prize in Medicine for discovering the role chromosomes play in heredity. He made an extensive study of the fruit fly, Drosophila. Morgan's group identified several sex related traits that could be related to the chromosomes of the flies. When the traits were compared to the chromosomes of the flies, each trait was represented with a minor chromosome change.