1907 In Science

Chemistry

• Emil Fischer artificially synthesizes peptide amino acid chains and thereby shows that amino acids in proteins are connected by amino group-acid group bonds
• Georges Urbain discovered Lutetium. From Lutetia (ancient name of Paris).

Geology

• Bertram Boltwood proposes that the amount of lead in uranium and thorium ores might be used to determine the Earth's age and crudely dates some rocks to have ages between 410--2200 million years

Physics

• Albert Einstein introduces the principle of equivalence of gravitation and inertia and uses it to predict the gravitational redshift

Psychology

• Ivan Pavlov demonstrates conditioned responses with salivating dogs

Medicine

• Paul Ehrlich develops a chemotherapeutic cure for sleeping sickness

Technology

• Lee DeForest invents the triode thermionic amplifier, starting the development of electronics as a practical technology.
• The Autochrome Lumire is the first color photography process marketed.

Awards

• Nobel Prizes
• Physics - Albert Abraham Michelson
• Chemistry - Eduard Buchner
• Medicine - Charles Louis Alphonse Laveran

Births

• January 12 - Sergei Korolev (d. 1966), space scientist.
• June 25 - Hans Daniel Jensen (d. 1973), German physicist.
• July 7 - Robert Heinlein (d. 1988), science fiction author
• August 30 - John Mauchly (d. 1980), co-inventor of the ENIAC computer.

Deaths

• January 20 - Dmitri Ivanovich Mendeleev (b. 1834), chemist.
• December 17 - William Thomson (b. 1824), Lord Kelvin, physicist.

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