How did the Dred Scott case change citizenship in the United States? Created by Kimberly Kutz.

The 1857 Supreme Court case Dred Scott v. Sandford inflamed sectional tensions over slavery and propelled the United States toward civil war. In this video, Kim discusses the case with scholars Christopher Bracey and Timothy Huebner. To learn more about US History, visit Khan Academy at https://www.khanacademy.org/humanities/ap-us-history To read more about constitutional law, visit the National Constitution Center’s website: https://constitutioncenter.org On this site, leading scholars interact and explore the Constitution and its history. For each provision of the Constitution, experts from different political perspectives coauthor interpretive explanations when they agree and write separately when their opinions diverge.

This art history video discussion examines Duccio's "The Rucellai Madonna", 1285-86, tempera on panel, 177 x 114" or 450 x 290 cm (Uffizi, Florence).

This art history video discussion examines Duccio di Buoninsegna, Madonna and Child, tempera and gold on panel, c. 1300 (Metropolitan Museum of Art).

This art history video discussion examines Duccio's "Maesta" (back view), 1308-11 (Museo dell'Opera Metropolitana del Duomo, Siena).

This art history video discussion examines Duccio's "Maesta" (front view), 1308-11 (Museo dell'Opera Metropolitana del Duomo, Siena).

This art history video discussion examines Duccio di Buoninsegna's "The Virgin and Child with Saints Dominic and Aurea", c. 1315, tempera on wood, 42.5 x 34.5 cm (National Gallery, London).

This art history video discussion examines Marcel Duchamp's "Boite-en-valise (the red box)", series F, 1960 (Portland Art Museum).

This art history video discussion looks at Marcel Duchamp's "Fountain" (1917/1964). Porcelain urinal, paint (San Francisco Museum of Modern Art).

This art history video discussion examines Albrecht Dürer's prints: "Four Horsemen of the Apocalypse" (ca. 1497–98) and "St. Jerome in his Study" (1514).

This art history video discussion examines Albrecht Dürer's "Self-portrait", 1498, oil on panel, 52 x 41 cm (Museo Nacional del Prado, Madrid).

This art history video discussion examines Albrecht Durer's "The Large Piece of Turf", 1503, watercolor and gouache on paper, 16-1/8 x 12-5/8 inches / 41 x 32 cm (Graphische Sammlung Albertina, Vienna)

This art history video dicussion examines William Dyce's "Pegwell Bay, Kent - a Recollection of October 5th 1858" 1858-60, oil on canvas (Tate Britain, London).

This art history video discussion examines "Dying Gaul", an ancient Roman marble copy of a lost bronze Greek sculpture, c. 220 BCE.

In this art history video discussion Beth Harris and Steven Zucker look at Albrecht Dürer's "The Four Apostles", oil on wood, 1526. Alte Pinakothek, Munich.

Review of Enterprise Value and comparing it to EBITDA. Created by Sal Khan.

Remember the relationship between current and voltage in an inductor and capacitor with the help of ELI the ICE man. Created by Willy McAllister.