All articles starting with O

Olapa Chasma

Olapa Chasma is a 650-km-diameter rift system (chasma) on Venus at 42° S, 208.5° E, in northwest Imdr Regio near Idunn Mons and Arasy Mons; named for a Massai moon goddess (IAU 1997), it is among Venus's most recent volcano-tectonic systems.

Oct 15, 2026

Olaparib

Olaparib, sold as Lynparza, is an oral PARP inhibitor that treats cancers with DNA repair defects; it was the first PARP inhibitor approved, in 2014, for BRCA-mutated ovarian cancer.

Olarizuko urmaela

Olarizuko urmaela, the Olarizu pond, is a periodically flooded wetland in the Olarizu fields south of Vitoria-Gasteiz, Spain, created as a flood-retention basin in 2014.

Oct 15, 2026

Olaroz Lithium Facility

The Olaroz Lithium Facility is a lithium brine operation on the Salar de Olaroz in Jujuy Province, Argentina, producing battery-grade lithium carbonate since 2014 at about 3,900 meters elevation.

Olathe, Kansas

Olathe (o-LAY-tha), Kansas: Shawnee word for "beautiful"; Johnson County seat founded 1857 by Dr. John Barton, a Santa Fe Trail stop raided by Quantrill in 1862, now the fourth largest Kansas city.

Olaudah Equiano

Olaudah Equiano (Gustavus Vassa, c.1745–1797), West African-born writer and abolitionist, purchased his freedom in 1766 and published the best-selling 1789 slave autobiography The Interesting Narrative; his African birthplace is debated.

Olaus Magnus

Olaus Magnus, born Olof Månsson, was a Swedish Catholic prelate and cartographer, the last titular archbishop of Uppsala, known for the 1539 Carta marina map.

Oct 22, 2026

Olav Aukrust

Olav Aukrust (1883–1929) was a Norwegian teacher, folk high school headmaster, and poet who wrote in Nynorsk and counted among the leading lyric poets of the interwar years.

Oct 10, 2026

Olav Duun

Olav Duun (1876–1939) was a Norwegian novelist and teacher, ranked among Norway's foremost, best known for the six-volume Juvikfolke cycle (1918–1923) and the Medmenneske trilogy (1929–1933).

Oct 22, 2026

Olav H. Hauge

Olav H. Hauge (1908–1994) was a Norwegian poet and fruit farmer in Ulvik who wrote in Nynorsk and became one of Norway's foremost lyric poets.

Olav, Kronprins av Norge

Olav, Kronprins av Norge was the Norwegian sailor who won 1928 Olympic gold in the 6-metre class aboard Norna, and later reigned as King Olav V from 1957 to 1991.

Oct 10, 2026

Olave Baden-Powell, Baroness Baden-Powell

Olave Baden-Powell, Baroness Baden-Powell, born Olave St Clair Soames, led the world Girl Guide movement, serving as UK Chief Guide from 1918 and World Chief Guide from 1930.

Oct 20, 2026

Olavi Rove

Olavi Antero Rove (Grönfelt), Finnish artistic gymnast (1915-1966): 1948 Olympic team gold and vault silver 0.1 behind Paavo Aaltonen, 1952 team bronze, 1950 Basel world all-around bronze.

Olavi Salonen

Olavi Salonen (1933–2025), Finnish middle-distance runner nicknamed Tankki, shared the 1,500 m world record 3:40.2 with Olavi Salsola in Turku in 1957; it fell the next day to Jungwirth. He won 15 Finnish titles and ran at the 1960 and 1964 Olympics.

Olavi Salsola

Olavi Salsola (1933–1995), Finnish middle-distance runner of the Olavi trio, co-set the 1500 m world record 3:40.2 at Turku on 11 July 1957 with Olavi Salonen; it stood one day. He competed in the 1956 Melbourne Olympics.

Oct 22, 2026

Olavo Bilac

Olavo Bilac (1865–1918) was a Brazilian Parnassian poet, journalist, and school inspector who founded the Academia Brasileira de Letras and wrote the Hino à Bandeira lyrics.

Olavo de Carvalho

Olavo de Carvalho (1947–2024), Brazilian self-taught philosopher, columnist and astrologer; ideologue of the Brazilian new right and Bolsonarism via his online philosophy course, olavismo, and cultural Marxism thesis.

Olavo Setúbal

Olavo Egydio Setubal (1923–2008) was a Brazilian engineer-turned-banker who built Banco Itaú into one of Brazil's largest private banks and served as São Paulo's mayor and foreign minister.

Olay

Olay is an American skin-care brand owned by Procter & Gamble, launched in South Africa in 1952 by chemist Graham Wulff as Oil of Olay.

Olayan Alwetaid

Olayan Alwetaid is a Saudi business executive who has led stc Group as CEO since 2021, after earlier roles at Saudi Aramco and stc Bahrain.

Olayemi Olurin

Olayemi Olurin, also known as Olurinatti, is a Bahamian-Nigerian-American lawyer, writer, and political commentator; a former NYC public defender, prison abolitionist, Rikers closure advocate, and founder of Olurinatti Media.

Olba Aqueduct

Roman aqueduct of Olba (Ὤλβα), Uğuralanı, Rough Cilicia, Turkey; drew Lamas River water from Kızılgeçit at about 1,175 m and crossed Seytan Deresi on a two-tiered Severan bridge about 150 m long.

Olbers (lunar crater)

Olbers is a 73 km wide impact crater on the Moon near the western edge of the near side, named in 1935 for German astronomer Heinrich Wilhelm Olbers.

Olbers' paradox

Olbers' paradox, also called the dark night sky paradox, asks why the night sky is dark if the universe is infinite, eternal, and full of stars.

Olbia (Sardinia)

Olbia was the only major Punic city of northeastern Sardinia, at the site of the modern city of Olbia in Gallura, walled in the 4th century BC and taken by Rome in 259 BC.

Olbia pedestal

The Olbia pedestal is a stone block bearing a Punic inscription, found in 1911 at ancient Olbia on Sardinia's eastern coast and deciphered by Ignazio Guidi.

Olca-Paruma

Olca-Paruma, a 15-km-long east-west chain of stratovolcanoes on the Chile-Bolivia border in the Central Andean Volcanic Arc; summit 5,705 m, only reported historical eruption an unconfirmed flank event in 1865-1867, now fumarolic and seismically monitored.