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Robot Arm

Clunky metal robotic arms can be dangerous for humans to work near.
Length 00:56 Premiere: 10/19/13

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Season Episodes

Athens: Birth of Democracy
S53 E8 Length 53:40 Premiere Date 04/15/26

Return to the Moon
S53 E7 Length 53:08 Premiere Date 04/29/26

Stone Age Temple Mystery
S53 E6 Length 53:25 Premiere Date 02/25/26

Rain Bombs
S53 E5 Length 53:24 Premiere Date 04/22/26

Mammal Origins
S53 E4 Length 53:38 Premiere Date 02/11/26

Can Dogs Talk?
S53 E3 Length 53:39 Premiere Date 02/04/26

Angkor: Hidden Jungle Empire
S53 E2 Length 53:39 Premiere Date 01/28/26

Asteroids: Spark of Life?
S53 E1 Length 53:31 Premiere Date 01/21/26

Rebuilding 7 World Trade Center
Clip Length 01:48 Premiere Date 08/31/11

The 9/11 Memorial Mock-Up
Clip Length 01:54 Premiere Date 08/24/11

Solving an Engineering Problem
Clip Length 02:49 Premiere Date 08/24/11

Walls of Glass
Clip Length 02:29 Premiere Date 08/24/11

The Memorial Plaques
Clip Length 02:31 Premiere Date 08/24/11

Brian Greene Answers Your Questions
Clip Length 01:07 Premiere Date 08/02/11

A Strict Carbon Diet
Clip Length 02:58 Premiere Date 04/12/11

Green Energy in China
Clip Length 05:09 Premiere Date 04/12/11

A Mind for Music
Clip Length 04:05 Premiere Date 02/09/11

Modeling a Comet Airburst
Clip Length 03:20 Premiere Date 02/09/11

Six Questions with David Pogue
Clip Length 02:33 Premiere Date 01/04/11

Surviving an Elevator Fall
Clip Length 01:31 Premiere Date 08/23/10

Shabbat Elevator
Clip Length 02:42 Premiere Date 08/23/10

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TV Schedules

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Upcoming

Secrets of the Forest - S52 E8

Scientists gather data on how forests work and try to figure out how they can help tackle the twin threats of climate change and species extinction.

  • Sunday June 21, 2026 7:00 pm ET on KET2
  • Sunday June 21, 2026 6:00 pm CT on KET2
  • Tuesday June 23, 2026 1:00 am ET on KET2
  • Tuesday June 23, 2026 12:00 am CT on KET2

Ancient Desert Death Trap - S52 E17

Archaeologists investigate strange Stone Age megastructures in the Arabian desert, built by a mysterious people 9000 years ago.

  • Wednesday June 24, 2026 9:00 pm ET on KET
  • Wednesday June 24, 2026 8:00 pm CT on KET
  • Thursday June 25, 2026 5:00 pm ET on KET
  • Thursday June 25, 2026 4:00 pm CT on KET
  • Friday June 26, 2026 2:00 am ET on KET
  • Friday June 26, 2026 1:00 am CT on KET
  • Sunday June 28, 2026 7:00 pm ET on KET2
  • Sunday June 28, 2026 6:00 pm CT on KET2
  • Tuesday June 30, 2026 1:00 am ET on KET2
  • Tuesday June 30, 2026 12:00 am CT on KET2

Athens: Birth of Democracy - S53 E7

Archaeologists investigate the dramatic origins of democracy in ancient Greece 2,500 years ago. Mass graves and ancient ruins where tyrants were murdered shine new light on the birth of a revolutionary form of government.

  • Wednesday July 1, 2026 8:00 pm ET on KET
  • Wednesday July 1, 2026 7:00 pm CT on KET
  • Thursday July 2, 2026 4:00 pm ET on KET
  • Thursday July 2, 2026 3:00 pm CT on KET
  • Friday July 3, 2026 1:00 am ET on KET
  • Friday July 3, 2026 12:00 am CT on KET

Revolutionary War Weapons - S52 E7

American and British archaeologists and historians reveal the technology, innovation and luck that determined the outcomes of key battles of the Revolutionary War.

  • Wednesday July 1, 2026 9:00 pm ET on KET
  • Wednesday July 1, 2026 8:00 pm CT on KET
  • Thursday July 2, 2026 5:00 pm ET on KET
  • Thursday July 2, 2026 4:00 pm CT on KET
  • Friday July 3, 2026 2:00 am ET on KET
  • Friday July 3, 2026 1:00 am CT on KET
  • Sunday July 5, 2026 7:00 pm ET on KET2
  • Sunday July 5, 2026 6:00 pm CT on KET2
  • Tuesday July 7, 2026 1:00 am ET on KET2
  • Tuesday July 7, 2026 12:00 am CT on KET2

Black Hole Apocalypse - S45 E1

Premiered On: 01/10/2018

Astrophysicist and novelist Janna Levin takes viewers on a journey to the frontiers of black hole science and explores what they can tell us about the nature of space, time and gravity.

  • Wednesday July 8, 2026 9:00 pm ET on KET
  • Wednesday July 8, 2026 8:00 pm CT on KET
  • Thursday July 9, 2026 5:00 pm ET on KET
  • Thursday July 9, 2026 4:00 pm CT on KET
  • Friday July 10, 2026 2:00 am ET on KET
  • Friday July 10, 2026 1:00 am CT on KET
  • Sunday July 12, 2026 7:00 pm ET on KET2
  • Sunday July 12, 2026 6:00 pm CT on KET2
  • Tuesday July 14, 2026 1:00 am ET on KET2
  • Tuesday July 14, 2026 12:00 am CT on KET2

Black Hole Universe - S45 E2

Premiered On: 07/03/2019

Join astrophysicist Janna Levin on a mind-bending journey to the frontiers of black hole research. Discover how scientists may soon be able to "see" a black hole and are revealing new clues to the strangest and most extreme objects in the universe.

  • Wednesday July 15, 2026 9:00 pm ET on KET
  • Wednesday July 15, 2026 8:00 pm CT on KET
  • Thursday July 16, 2026 5:00 pm ET on KET
  • Thursday July 16, 2026 4:00 pm CT on KET
  • Friday July 17, 2026 2:00 am ET on KET
  • Friday July 17, 2026 1:00 am CT on KET
  • Sunday July 19, 2026 7:00 pm ET on KET2
  • Sunday July 19, 2026 6:00 pm CT on KET2
  • Tuesday July 21, 2026 1:00 am ET on KET2
  • Tuesday July 21, 2026 12:00 am CT on KET2
Jump to Upcoming Airdates

Recent

Secrets of the Forest - S52 E8

  • Friday June 19, 2026 2:00 am ET on KET
  • Friday June 19, 2026 1:00 am CT on KET
  • Thursday June 18, 2026 5:00 pm ET on KET
  • Thursday June 18, 2026 4:00 pm CT on KET
  • Wednesday June 17, 2026 9:00 pm ET on KET
  • Wednesday June 17, 2026 8:00 pm CT on KET

Alaskan Dinosaurs - S48 E21

  • Tuesday June 16, 2026 1:00 am ET on KET2
  • Tuesday June 16, 2026 12:00 am CT on KET2
  • Sunday June 14, 2026 7:00 pm ET on KET2
  • Sunday June 14, 2026 6:00 pm CT on KET2
  • Friday June 12, 2026 2:00 am ET on KET
  • Friday June 12, 2026 1:00 am CT on KET
  • Thursday June 11, 2026 5:00 pm ET on KET
  • Thursday June 11, 2026 4:00 pm CT on KET
  • Wednesday June 10, 2026 9:00 pm ET on KET
  • Wednesday June 10, 2026 8:00 pm CT on KET

Can Dogs Talk? - S53 E3

  • Tuesday June 9, 2026 1:00 am ET on KET2
  • Tuesday June 9, 2026 12:00 am CT on KET2
  • Sunday June 7, 2026 7:00 pm ET on KET2
  • Sunday June 7, 2026 6:00 pm CT on KET2

Great Mammoth Mystery - S49 E3

  • Tuesday June 2, 2026 1:00 am ET on KET2
  • Tuesday June 2, 2026 12:00 am CT on KET2
  • Sunday May 31, 2026 7:00 pm ET on KET2
  • Sunday May 31, 2026 6:00 pm CT on KET2
  • Friday May 29, 2026 2:00 am ET on KET
  • Friday May 29, 2026 1:00 am CT on KET
  • Thursday May 28, 2026 5:00 pm ET on KET
  • Thursday May 28, 2026 4:00 pm CT on KET
  • Wednesday May 27, 2026 9:00 pm ET on KET
  • Wednesday May 27, 2026 8:00 pm CT on KET

When Whales Could Walk - S51 E1

  • Tuesday May 26, 2026 1:00 am ET on KET2
  • Tuesday May 26, 2026 12:00 am CT on KET2
  • Sunday May 24, 2026 7:00 pm ET on KET2
  • Sunday May 24, 2026 6:00 pm CT on KET2
  • Friday May 22, 2026 2:00 am ET on KET
  • Friday May 22, 2026 1:00 am CT on KET
  • Thursday May 21, 2026 5:00 pm ET on KET
  • Thursday May 21, 2026 4:00 pm CT on KET
  • Wednesday May 20, 2026 9:00 pm ET on KET
  • Wednesday May 20, 2026 8:00 pm CT on KET
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