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Arctic Sinkholes Preview
Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas.
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Who created the Nazca lines and why? New clues to one of the greatest ancient enigmas.
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Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.
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Sir David Attenborough explores a site with traces of ancient mammoths and Neanderthals.
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In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate
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53:17
Intrepid paleontologists discover that dinosaurs thrived in the Arctic’s cold and dark.
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53:28
Take a tasty look at insect foods that could benefit our health and our warming planet.
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53:28
Join the hunt for the universe’s most common—yet most elusive and baffling—particle.
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As state-legalized cannabis spreads, NOVA explores its little-known risks and benefits.
