When did humans migrate to the Americas
Learn about a controversial 2017 study that used thorium/uranium dating of broken mastodon bones to argue that a prehistoric human species, such as Neanderthals, lived in North America some 130,000 years ago.
Encyclopædia Britannica, Inc.
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Encyclopædia Britannica, Inc.August 29, 2005: Katrina strikes the Gulf Coast.Media Editors: Lee Goldstein , Lauren Sims
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Encyclopædia Britannica, Inc.An overview of the settlement of Texas in the early 19th century.
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail Bundesarchiv, Bild 146-1972-025-10 (CC BY-SA 3.0)Learn about the July Plot of 1944, in which Claus, Count Schenk von Stauffenberg, and others tried to assassinate Hitler and overthrow the Nazi regime.
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Contunico © ZDF Studios GmbH, MainzDiscussion of biological clocks, including an overview of the suprachiasmatic nucleus, which controls circadian rhythms.
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Courtesy of Northwestern University (A Britannica Publishing Partner)How the billion-year-old Midcontinent Rift helped form Lake Superior.
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© MinuteEarth (A Britannica Publishing Partner)Comparing the similarities and differences between the genomes of chimpanzees (Pan troglodytes) and human beings (Homo sapiens).
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Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.comThe distribution of the seven continents.
