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How Much Of You Is Alive?

Bits of you are always breaking down, being thrown out, and being replaced. Even right now, parts of you are dying. Some of your cells even died before you were born. And some will never come back. These are all very strange, mildly uncomfortable things to think about. And what’s even stranger than that is a big fraction of your body is, was, and will never be alive. So how much of you is dead?

Season 9 Episode 10 Length 12:05 Premiere: 09/07/21

Recent Episodes

The Intelligence Test Where Ants Beat Humans

S13 E17 Length 14:52 Premiere Date 02/05/26

Everything I Thought I Knew About Flavor Was Wrong

S13 E16 Length 19:50 Premiere Date 01/15/26

The Scientific Lie That Damaged Generations of Men

S13 E15 Length 20:05 Premiere Date 12/18/25

Inside the Vault Where They Keep the Dinosaur Apocalypse

S13 E14 Length 22:36 Premiere Date 12/04/25

Mars Used to Be Blue... Then Something Happened

S13 E12 Length 11:08 Premiere Date 10/23/25

Be Smart about Autism

S13 E11 Length 36:47 Premiere Date 10/02/25

Specials

The Mystery of Earth's Disappearing Giants

Length 21:29 Premiere Date 09/16/21

Dung Beetles: The Poop-Rolling Stargazers of the Serenget

Length 17:08 Premiere Date 09/01/21

These Butt-Tickling Ants Are Endangered Butterfly Bodyguards

Length 20:59 Premiere Date 08/18/21

These Death-Eating Scavengers Are Real Life-Savers

Length 29:33 Premiere Date 08/04/21

Elephant Moms Carry the Wisdom of Generations

Length 25:36 Premiere Date 07/21/21

Are Some Species More Important Than Others?

Length 25:47 Premiere Date 07/08/21

The Surprising Species That Everything Else Depends On

Length 25:47 Premiere Date 07/08/21

The Superb Owl!

Length 04:11 Premiere Date 02/02/17

The 12 Days of Evolution - Complete Series!

Length 17:43 Premiere Date 01/26/17

The Surprising Origin of Thanksgiving Foods

Length 05:09 Premiere Date 11/13/16

Do Animals Mourn Their Dead?

Length 04:17 Premiere Date 10/23/16

Season 9 Episodes

Show Episodes

Show Clips & Previews

The Unbelievable Science of How We Read

S9 E20 Length 16:14 Premiere Date 02/15/22

The Weird Way That Movies Trick Your Brain

S9 E19 Length 17:56 Premiere Date 02/01/22

Here's What I Learned…

S9 E18 Length 16:20 Premiere Date 01/25/22

Can We Actually Clean Up the Plastic Pollution Problem?

S9 E17 Length 15:15 Premiere Date 01/06/22

Why Do We Dream?

S9 E16 Length 14:29 Premiere Date 12/22/21

What Is Nothing?

S9 E15 Length 14:06 Premiere Date 11/23/21

Inside the Largest Living Thing On Earth

S9 E14 Length 09:21 Premiere Date 11/06/21

Sand Dunes Shouldn’t Exist (Here’s Why They Do)

S9 E13 Length 15:33 Premiere Date 10/20/21

I Can't Believe We're Making Another COVID Video

S9 E12 Length 16:20 Premiere Date 10/08/21

How the Zebra Really Got Its Stripes?

S9 E11 Length 13:13 Premiere Date 09/22/21

How Much Of You Is Alive?

S9 E10 Length 12:05 Premiere Date 09/07/21

Why Is Sex a Thing?

S9 E9 Length 12:31 Premiere Date 07/30/21

A Brief (Scientific) History of Butts

S9 E8 Length 12:27 Premiere Date 06/30/21

How Your Brain Makes Its Own Electricity

S9 E7 Length 18:46 Premiere Date 06/02/21

Why Are We Warm-Blooded?

S9 E6 Length 11:18 Premiere Date 05/04/21

How Ocean Currents Work (and How We Are Breaking Them)

S9 E5 Length 12:38 Premiere Date 04/19/21

The Transcontinental Burrito Hypertunnel

S9 E4 Length 11:57 Premiere Date 04/01/21

What is Impossible in Evolution?

S9 E3 Length 19:29 Premiere Date 03/17/21

The Golden Ratio: Is It Myth or Math?

S9 E2 Length 22:36 Premiere Date 03/10/21

When Is Now?

S9 E1 Length 20:26 Premiere Date 02/15/21

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