Skip to Main Content
Watch Senate Chambers Watch House Chambers

How the Starfish Got Its Arms

The story of how the starfish got its arms reminds us that even animals that might be familiar to us today can have incredibly deep histories - ones that stretch back almost half a billion years.
Season 4 Episode 5 Length 10:53 Premiere: 08/24/21

Recent Episodes

Sponsored by:

Specials

Season 4 Episodes

The Fungi That Turned Ants Into Zombies
S4 E40 Length 08:13 Premiere Date 08/23/22

How Whale Evolution Kind Of Sucked
S4 E39 Length 09:49 Premiere Date 08/16/22

Did An Ancient Pathogen Reshape Our Cells?
S4 E38 Length 07:40 Premiere Date 08/09/22

Why Does Caffeine Exist?
S4 E37 Length 08:29 Premiere Date 07/28/22

How Plate Tectonics Transformed Los Angeles
S4 E36 Length 12:34 Premiere Date 07/21/22

When Giant Millipedes Reigned
S4 E35 Length 07:02 Premiere Date 07/12/22

Giant Viruses Blur The Line Between Alive and Not
S4 E34 Length 09:19 Premiere Date 06/29/22

Something Has Been Making This Mark For 500 Million Years
S4 E33 Length 09:42 Premiere Date 06/15/22

We Can “Bring Back” The Woolly Mammoth. Should We?
S4 E32 Length 06:40 Premiere Date 06/08/22

Is This The Oldest Dad In The Fossil Record?
S4 E31 Length 06:37 Premiere Date 05/26/22

The Curious Case of the Cave Lion
S4 E30 Length 08:09 Premiere Date 05/17/22

When Ants Domesticated Fungi
S4 E29 Length 09:05 Premiere Date 05/10/22

The Ancient Human Species With A Missing Body
S4 E28 Length 07:56 Premiere Date 04/27/22

Why Sour May Be The Oldest Taste
S4 E27 Length 07:02 Premiere Date 04/20/22

How the Smallest Animal Got So Simple
S4 E26 Length 06:52 Premiere Date 04/13/22

The Extreme Hyenas That Didn't Last
S4 E25 Length 07:50 Premiere Date 03/29/22

The Sudden Rise of the First Colossal Animal
S4 E24 Length 08:44 Premiere Date 03/22/22

When a Giant Pterosaur Ruled the European Islands
S4 E23 Length 08:50 Premiere Date 03/15/22

Why We Only Have Ten Toes (It's a Long Story)
S4 E22 Length 09:12 Premiere Date 02/23/22

How Horses Went From Food To Friends
S4 E21 Length 06:32 Premiere Date 02/16/22

How Vertebrates Got Teeth... And Lost Them Again
S4 E20 Length 08:52 Premiere Date 02/08/22

Did Eating Insects Shrink These Dinos?
S4 E19 Length 10:21 Premiere Date 01/27/22

Primates vs Snakes (An Evolutionary Arms Race)
S4 E18 Length 07:53 Premiere Date 01/18/22

How Our Deadliest Parasite Turned To The Dark Side
S4 E17 Length 08:06 Premiere Date 01/11/22

When Pterosaurs Walked
S4 E16 Length 09:38 Premiere Date 12/16/21

The 40 Million-Year-Old Ecosystem In Your Mouth
S4 E15 Length 08:14 Premiere Date 12/09/21

Why The Paleo Diet Couldn't Save The Neanderthals
S4 E14 Length 09:17 Premiere Date 12/02/21

When It Was Too Hot for Leaves
S4 E13 Length 10:11 Premiere Date 11/17/21

How Dinosaurs Coupled Up
S4 E12 Length 07:49 Premiere Date 10/28/21

How Ancient Whales May Have Changed the Deep Ocean
S4 E11 Length 10:05 Premiere Date 10/21/21

When Mammals Only Went Out At Night
S4 E10 Length 11:09 Premiere Date 10/07/21

How a Mass Extinction Event Created the Amazon
S4 E9 Length 07:55 Premiere Date 09/29/21

How a Supervolcano Ignited an Evolutionary Debate
S4 E8 Length 09:59 Premiere Date 09/23/21

How Pollination Got Going Twice
S4 E7 Length 09:32 Premiere Date 09/16/21

The Creature That Stumped Darwin
S4 E6 Length 06:46 Premiere Date 09/01/21

How the Starfish Got Its Arms
S4 E5 Length 10:53 Premiere Date 08/24/21

Where Are All the Medium-Sized Dinosaurs?
S4 E4 Length 11:01 Premiere Date 08/12/21

The Island of the Last Surviving Mammoths
S4 E3 Length 08:06 Premiere Date 07/29/21

The Traits That Spawned the Age of Mammals
S4 E2 Length 07:44 Premiere Date 07/21/21

Did These Giant Sloths Poop Themselves to Death?
S4 E1 Length 10:01 Premiere Date 07/14/21

See All Episodes

caret down

TV Schedules

Upcoming

No upcoming airdates

Recent

No recent airdates

Explore KET