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How the Immune System Fights Cancer

Researchers discover how cancer masks itself from the immune system and figure out how patients’ immune systems can recognize cancer cells and attack them.
Clip Season 47 Episode 5 Length 02:49 Premiere: 04/01/20

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Season 47 Episodes

Beyond the Elements: Life
S47 E19 Length 53:32 Premiere Date 02/17/21

Beyond the Elements: Indestructible
S47 E18 Length 53:30 Premiere Date 02/10/21

Beyond the Elements: Reactions
S47 E17 Length 53:31 Premiere Date 02/03/21

Can We Cool the Planet?
S47 E16 Length 53:31 Premiere Date 10/28/20

Touching the Asteroid
S47 E15 Length 53:32 Premiere Date 10/21/20

A to Z: How Writing Changed the World
S47 E14 Length 53:32 Premiere Date 09/30/20

A to Z: The First Alphabet
S47 E13 Length 54:02 Premiere Date 09/23/20

Secret Mind of Slime
S47 E12 Length 53:17 Premiere Date 09/16/20

Human Nature
S47 E11 Length 1:33:41 Premiere Date 09/09/20

Decoding COVID-19
S47 E10 Length 53:38 Premiere Date 05/13/20

Nature's Fear Factor
S47 E9 Length 53:21 Premiere Date 10/14/20

Saving Notre Dame
S47 E8 Length 53:52 Premiere Date 11/25/20

Eagle Power
S47 E7 Length 53:22 Premiere Date 05/20/20

The Truth About Fat
S47 E6 Length 53:29 Premiere Date 04/08/20

Mysteries of Sleep
S47 E4 Length 53:26 Premiere Date 02/26/20

Cat Tales
S47 E3 Length 56:00 Premiere Date 02/19/20

Dog Tales
S47 E2 Length 53:21 Premiere Date 02/12/20

Polar Extremes
S47 E1 Length 1:52:42 Premiere Date 02/05/20

Cuba's Cancer Hope Preview
Preview Length 00:28 Premiere Date 04/01/20

An American Cancer Patient Receives Treatment in Cuba
Clip Length 04:51 Premiere Date 04/01/20

How the Immune System Fights Cancer
Clip Length 02:49 Premiere Date 04/01/20

Antarctica: Journey to the Bottom of the Earth
Clip Length 14:11 Premiere Date 01/29/20

How Antarctica’s Cutest Baby Seals Grow Up
Clip Length 10:50 Premiere Date 02/05/20

Why is this Antarctic Glacier “Bleeding?”
Clip Length 10:00 Premiere Date 02/11/20

What is it Like to Live in Antarctica?
Clip Length 09:41 Premiere Date 02/26/20

Three Solutions That Can Slow or Stop Climate Change
Clip Length 04:21 Premiere Date 06/04/20

Cutting our Greenhouse Gas Emissions to Zero
Clip Length 04:52 Premiere Date 06/19/20

Can Geoengineering “Undo” Climate Change?
Clip Length 04:41 Premiere Date 06/24/20

How Communities Can Adapt to Climate Change
Clip Length 03:59 Premiere Date 06/29/20

Losing a Loved One to Early Onset Alzheimer's
Clip Length 04:53 Premiere Date 09/02/20

The Joys and Challenges of Birding While Black
Clip Length 03:54 Premiere Date 09/03/20

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Einstein's Quantum Riddle

Premiered On: 01/09/2019

Physicists capture light from across the universe in a bid to prove Einstein's quantum entanglement.

  • Sunday April 2, 2023 7:00 pm ET on KET2
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Arctic Sinkholes

Scientists investigate colossal explosions in Siberia and other evidence that rapidly melting soil in the Arctic is releasing vast amounts of methane, a potent greenhouse gas.

  • Wednesday April 5, 2023 9:00 pm ET on KET
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Weathering the Future

As extreme weather in the U.S. impacts more people - with longer heat waves, more intense rainstorms, megafires, and droughts - discover how Americans are fighting back by marshaling ancient wisdom and innovating new solutions.

  • Wednesday April 12, 2023 9:00 pm ET on KET
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Edible Insects

Premiered On: 10/20/2021

From crunchy cricket chips to nutty black soldier fly grubs, explore the insect food industry and how it could benefit our health and our warming planet.

  • Thursday April 20, 2023 5:00 pm ET on KET
  • Thursday April 20, 2023 4:00 pm CT on KET

Great Escape at Dunkirk

Premiered On: 02/14/2018

Join archaeologists and divers recovering remains of ships and planes lost during World War II's epic Dunkirk operation. Discover new evidence of the ingenious technology that helped save Allied forces from defeat by the encircling Germans.

  • Sunday April 23, 2023 7:00 pm ET on KET2
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Chasing Carbon Zero

Learn about the technologies that could help the U.S. reach net-zero carbon emissions by 2050.

  • Wednesday April 26, 2023 9:00 pm ET on KET
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Saving The Right Whale

  • Wednesday May 3, 2023 9:00 pm ET on KET
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Einstein's Quantum Riddle - S46 E2

  • Friday March 31, 2023 2:00 am ET on KET
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Ancient Maya Metropolis - S48 E22

  • Wednesday March 29, 2023 8:00 am ET on KETWORLD
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Kilauea: Hawaii on Fire - S46 E3

  • Wednesday March 22, 2023 8:00 am ET on KETWORLD
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Dog Tales - S47 E2

  • Wednesday March 15, 2023 9:00 am ET on KETWORLD
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Cat Tales - S47 E3

  • Wednesday March 15, 2023 8:00 am ET on KETWORLD
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Picture a Scientist - S48 E3

  • Wednesday March 8, 2023 8:00 am ET on KETWORLD
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New Eye on the Universe - S50 E4

  • Wednesday March 1, 2023 8:00 am ET on KETWORLD
  • Wednesday March 1, 2023 7:00 am CT on KETWORLD
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