Cato Maximilian Guldberg was born on this day in 1836. Norwegian chemist who, with his brother-in-law Peter Waage, formulated the law of mass action (1864), which details the effects...

On this day in 1897, Dr. Felix Hoffmann successfully created a chemically pure and stable form of acetylsalicylic acid. His handwritten laboratory notes—aspirin's “birth certificate”—suggested: “Through its physical characteristics...

Count of Quaregna Amedeo Avogadro was born on this day in 1776. Italian chemist and physicist who found that at the same temperature and pressure...

  Germain Henri Hess was born on this day in 1802. Swiss-Russian chemist whose studies of heat in chemical reactions formed the foundation of thermochemistry. He...

Famous chemist Jöns Jacob Berzelius was died on this day in 1848. Swedish chemist who established the beginnings of modern chemistry. Among his contributions are...

On this day in 1945, the first atomic bomb used in World War II was dropped on Hiroshima, Japan. The weapon, code-named “Little Boy,” was...

  Nicolas-Jacques Conté was born on this day in 1755. French inventor who devised a method of manufacturing pencil leads by mixing a finely powdered...

 Tadeus Reichstein died on this day in 1996. Swiss chemist who, with Philip S. Hench and Edward C. Kendall, received the Nobel Prize for Physiology or Medicine in 1950 for...