1918 - Jens Christian Skou was born.

Skou was is a Danish biochemist who was awarded half the 1997 Nobel Prize in Chemistry for the discovery of the first ion-transporting enzyme. The enzyme he discovered is called sodium-potassium-activated adenosine triphosphatase, or more simply, Na⁺-K⁺ATPase.This enzyme acts as a pump that exchanges sodium ions for potassium ions in plasma membranes of animal cells.

1917 - Rodney Robert Porter was born.

Porter was an English biochemist who shares the 1972 Nobel Prize in Medicine with Gerald Edelman for their independent determination of the chemical structure of antibodies. They both broke the immunoglobulin G (IgG) antibody molecule into smaller pieces and determined the structures of the pieces. They then compiled the smaller structures and determined the complete larger structure.

1904 - Clemens Alexander Winkler died.

Winkler was a German chemist who discovered and isolated the element germanium. Germanium was a hole in Mendeleev's periodic table that he named ekasilicon. Winkler discovered the new element while investigating the mineral argyrodite that was mainly composed of sulfur and silver.

1883 - Otto Heinrich Warburg was born.

Warburg was a German biochemist who was awarded the 1931 Nobel Prize in Medicine for his discoveries into cellular respiration or how living cells take up oxygen. He identified the family of enzymes called cytochromes where the iron-containing heme group binds oxygen. He also isolated the first flavoprotein, flavine that participates in dehydrogenation reactions in cells.

1873 - Ejnar Hertzsprung was born.

Hertzsprung was a Danish astonomer who classified types of stars by surface temperature or color to their bightness. He produced the Hertzsprung-Russell diagram with Henry Russell to graphically illustrate the spectral class of stars based on temperature and absolute magnitude. This chart is used in the study of stellar evolution. He also created a luminosity scale of Cepheid variable stars.

1850 - Henry-Louis Le Chatelier was born.

Le Chatelier was a French chemist who devised the Le Chatelier principle to describe changes in equilibrium in chemical reactions. He showed how changes in partial pressure, volume, concentration or temperature of a chemical reaction at equilibrium will cause the reaction to compensate for the change.