Scientists, inventors and mathematicians
Notable peoplePoliticians and leadersScientists, inventors, and mathematiciansWriters and journalistsReligious figuresRevolutionaries and activistsPhilosophers and social scientistsWritersScientists, inventors and mathematiciansMusicians and composersPhilosophers, historians, political and social scientistsVisual artistsSports figuresMilitary leaders and theoristsRebels, revolutionaries and activistsEntertainersLeaders and politiciansExplorersDirectors, producers and screenwritersBusinesspeopleScientists and inventorsMathematiciansJournalistsArtistsMusiciansCriminalsFilmmakers
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- Ohm's acoustic lawLaw according to which a sound is perceived by the ear as a number of pure harmonic tones
- Olivia JudsonOlivia P. Judson (born 1970) is a British evolutionary biologist and science writer. She i
- On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection1858 scientific article
- Opening of the Liverpool and Manchester Railway1830 railway opening in England
- Operation GreenhouseSeries of 1950s American nuclear tests
- Order of the Polar StarSwedish order of chivalry
- ÖstergötlandÖstergötland (Swedish pronunciation: ; English exonym: East Gothland) is one of the tradit
- Otto HahnGerman nuclear chemist and Nobel laureate (1879–1968)
- Otto Hahn (petrologist)Otto Hahn (1828 – 1904) was a German petrologist, geologist, lawyer and author. His father
- Owen ToonOwen Brian Toon (born May 26, 1947 in Bethesda, Maryland) is an American professor of atmo