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Tiwanaku: A little-known pre-Incan civilization that built temples and cities high in the AndesThis ancient city in modern-day Bolivia is almost 13,000 feet above sea level. Only a small portion of the ruins have been excavated.
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Echidnas: Facts about spiky Australian mammals that lay eggsDiscover interesting facts about echidnas, the strange platypus relative with spines, spurs and a pouch.
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The human heart: Facts about the body's hardest-working muscleDiscover interesting facts about the fist-size organ that powers the circulatory system.
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The San Andreas Fault: Facts about the crack in California's crust that could unleash the 'Big One'California's San Andreas Fault is capable of triggering a massive earthquake. Here's what to know about this famous location often associated with earthquakes.
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Who were the Denisovans, archaic humans who lived in Asia and went extinct around 30,000 years ago?Who were the Denisovans, close human relatives who lived in Asia and mated with Homo sapiens?
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Crows: Facts about the clever birds that live all over the worldDiscover interesting facts about how crows remember faces, mimic human speech and more.
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What are the Dead Sea Scrolls, the ancient texts from the Hebrew Bible found in the caves of Qumran?The famous biblical manuscripts were found in caves near this ancient settlement.
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HIV/AIDS: Facts about the viral infection that attacks the immune systemLearn how HIV spreads, how it affects the body and what treatments are available.
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The sun: Facts about the bright star at the center of the solar systemDiscover interesting facts about the sun, the solar system's central star that supports all life on Earth.
