is the birthday of The Svedberg, a Swedish chemist who invented the ultracentrifuge, an instrument used to determine the weight of proteins.
Svedberg, who was born in 1884, studied the chemistry of colloids--solid compounds, such as proteins, suspended in a liquid--at the University of Uppsala. His first centrifuge, which he developed in 1924, generated a force 5000 times greater than gravity; later versions even reached hundreds of thousands of times gravity. Svedberg used the ultracentrifuge to precisely determine the molecular weights of complex proteins, such as hemoglobin, a feat for which he received the Nobel Prize for Chemistry in 1926. He died in 1971.
[Source: Britannica Online]