Image 2The number π (/paɪ/ ⓘ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, t… en.wikipedia.org Visit source

Image 1Logic studies valid forms of inference like modus ponens.Logic is the study of correct reasoning. It in… en.wikipedia.org Visit source

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Image 18Ziegler Polar ExpeditionPhoto credit: Anthony FialaA panorama from the Ziegler Polar Expedition of 190… en.wikipedia.org Visit source

Image 17ShivaPhoto: Los Angeles County Museum of ArtA Chola dynasty sculpture depicting Shiva. In Hinduism, Sh… en.wikipedia.org Visit source

Image 16Anti-Slavery SocietyPainting by Benjamin HaydonBenjamin Haydon's painting of Thomas Clarkson addressin… en.wikipedia.org Visit source

Image 15Edward GibbonPainting: Henry WaltonEdward Gibbon (1737–1794) was an English historian who published Th… en.wikipedia.org Visit source

Image 14Slavery in the United StatesPhoto credit: McPherson and OliverScars of a whipped slave named Peter, ph… en.wikipedia.org Visit source

Image 13SamuraiPhotograph: Felice BeatoA samurai with his sword and armor, photographed by Felice Beato c. 186… en.wikipedia.org Visit source

Image 12Arg-e BamPhotograph credit: Diego DelsoThe Arg-e Bam, in Kerman Province in southeastern Iran, is the… en.wikipedia.org Visit source

Image 11Operation IvyPhoto: United States Department of EnergyThe mushroom cloud from the Ivy Mike nuclear tes… en.wikipedia.org Visit source

Image 10Selimiye BarracksLithography: Day & Son; Restoration: Jake WartenbergAn 1856 lithograph of the Selimiy… en.wikipedia.org Visit source

Image 9The "Theatre" at PetraPhoto: Douglas PerkinsPetra is an archaeological site in Jordan, lying in a basin… en.wikipedia.org Visit source

Image 8MasadaPhotograph: Andrew ShivaAn aerial view of Masada, an ancient fortification in the Southern Distri… en.wikipedia.org Visit source

Image 7Invasion of NormandyPhoto credit: United States Coast GuardLanding ships putting ashore on Omaha Beach… en.wikipedia.org Visit source

Image 6Machu PicchuPhoto: Martin St-AmantMachu Picchu, a 15th-century Peruvian Inca site located 2,430 metres… en.wikipedia.org Visit source

Image 5Warsaw Ghetto UprisingPhoto credit: USHMMJews captured by SS and SD troops during the suppression of th… en.wikipedia.org Visit source

Image 4German occupation of CzechoslovakiaPhoto credit: Völkischer BeobachterA crying Sudeten woman salutes Ad… en.wikipedia.org Visit source

Image 3First flying machineArtist: UnknownA 1786 depiction of the first hot air balloon to carry humans, built… en.wikipedia.org Visit source

Image 21906 San Francisco earthquakePhoto credit: H. D. ChadwickThe Mission District of San Francisco, Califor… en.wikipedia.org Visit source

Image 1Siege of Sevastopol (1854–1855)Artist: William Simpson; Restoration: Lise BroerA lithograph of a waterc… en.wikipedia.org Visit source

Image 15 AHS Centaur following her conversion to a hospital ship. The Red Cross designation "47" can be seen o… en.wikipedia.org Visit source

Image 14 Doctor Pierre-François Percy's original paper on Tarrare's medical history, Mémoire sur la polyphagie… en.wikipedia.org Visit source

Image 13 Roderic (Stan) Dallas, 1918Roderic Stanley (Stan) Dallas, DSO, DSC & Bar (30 July 1891 – 1 June 1918)… en.wikipedia.org Visit source

Image 12 Minerve (second from left) at the action of 25 September 1806HMS Alceste was built at Rochefort in 18… en.wikipedia.org Visit source