June 16:
(1) (1858) English physician John Snow passed away. He is remembered for his work with anaesthesia researching water quality and detecting water as the source of the 1854 London cholera outbreak.
(2) (1902) American scientist and cytogeneticist Barbara McClintock was born. She used transposition to show that genes are responsible for turning physical characteristics on and off.
(3) (1920) Canadian organic chemist Raymond Urgel Lemieux was born. He is known for synthesizing sucrose (a sugar),
