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Art in the intro
Every portrait and painting in the intro is in the public domain. Each one links to its file on Wikimedia Commons.
- Leonardo da VinciSelf-portrait in red chalk, Leonardo da Vinci, c. 1517
- MichelangeloPortrait, attributed to Daniele da Volterra, 1545
- Alexander the GreatThe Alexander Mosaic, Pompeii, c. 100 BC
- Nikola TeslaPhotograph, Napoleon Sarony, c. 1890
- Marie CuriePhotograph, Henri Manuel, c. 1920
- Isaac NewtonPortrait, Godfrey Kneller, 1689
- ConfuciusPortrait, attributed to Wu Daozi, 8th century
- Ada LovelacePortrait, Alfred Edward Chalon, c. 1840
- Mansa MusaThe Catalan Atlas, attributed to Abraham Cresques, 1375
- Vincent van GoghSelf-portrait, Vincent van Gogh, 1889
- The Great Wave off KanagawaWoodblock print, Katsushika Hokusai, c. 1831
- Mona LisaPainting, Leonardo da Vinci, 1503 to 1506
- Albert EinsteinPhotograph, Ferdinand Schmutzer, 1921
- William ShakespeareThe Chandos portrait, attributed to John Taylor
- Galileo GalileiPortrait, Justus Sustermans, 1636
- Frederick DouglassPhotograph, George Kendall Warren, c. 1879
- Charles DarwinPhotograph, Julia Margaret Cameron, 1868
- The Starry NightPainting, Vincent van Gogh, 1889
- Girl with a Pearl EarringPainting, Johannes Vermeer, c. 1665
- Harriet TubmanPhotograph, Horatio Seymour Squyer, c. 1885
- Ludwig van BeethovenPortrait, Joseph Karl Stieler, 1820
- Plato and AristotleThe School of Athens (detail), Raphael, 1509