Sea Level Rise: When 1 in = 2 ft

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Clip: S42 | 2m 42s | Sea levels will rise by the same amount all over the world, right? Wrong. Here’s why. (2m 42s)

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Space Pics That Amaze Scientists

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Clip: S42 | 2m 52s | We asked scientists, “What are your favorite images from space?” Here’s what they said. (2m 52s)

Ghosts of Subatomic Particles

Clip: S42 | 1m 42s | The universe’s smallest particles fly down from space and emit from a radioactive rod. (1m 42s)

North American Gold

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Clip: S42 Ep22 | 2m 28s | When the Earth formed, most of the gold sunk to its core—but some remained trapped inside (2m 28s)

Secrets of the Ghost Forest

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Clip: S42 Ep20 | 3m 7s | Meet the earthquake that drowned the Pacific Northwest. (3m 7s)

What is Spacetime?

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Clip: S42 Ep23 | 2m 6s | A mysterious concept changed the way we understand reality. (2m 6s)

Gravity's Effect on Spacetime

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Clip: S42 Ep23 | 1m 48s | Einstein's theory showed that time itself is affected by gravity. (1m 48s)

Einstein’s Thought Experiment

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Clip: S42 Ep23 | 1m 49s | Your perception of time depends on how you are moving. (1m 49s)

These Boulders are Alive

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Clip: S42 Ep21 | 2m 48s | Dive down to rare stromatolites—key clues to the evolution of virtually all complex life. (2m 48s)

Time Travel in the Grand Canyon

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Clip: S42 Ep20 | 4m 33s | What does this geological wonder reveal about North America’s deep history? (4m 33s)

Are We Ready for a Cyber Attack?

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Clip: S42 Ep17 | 4m | Cyber threats from nation states and lone hackers are a persistent threat to America’s cri (4m)

How Music is Made Up of Math

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Clip: S42 Ep7 | 2m 1s | Pythagoras saw a connection between math, music, and nature. (2m 1s)

Do Plants Know Math?

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Clip: S42 Ep7 | 2m 24s | Evolution seems to favor these numbers. (2m 24s)

Can Lemurs Count?

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Clip: S42 Ep7 | 2m 1s | Researchers designed a test to see how well lemurs can compare quantities. (2m 1s)

Hagia Sophia: Istanbul's Mystery Preview

Preview: S42 Ep4 | 30s | How has this unique structure, built on a seismic fault, survived centuries of quakes? (30s)

Petra: Lost City of Stone Preview

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Preview: S42 Ep5 | 30s | How did early engineers carve tombs into rock cliffs and funnel water to this desert city? (30s)

Colosseum: Roman Death Trap Preview

Preview: S42 Ep6 | 30s | 1500 years ago, how did the Romans engineer bloody spectacles and reenact sea battles? (30s)