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Be Smart

Why Are There As Many Males As Females?

Season 6 Episode 5 | 5m 19s

In almost every animal species on Earth, equal numbers of males and females are conceived. Why is that? Especially in populations like lions or elephant seals, where most males don’t get to mate? That’s survival of the laziest, not survival of the fittest. It turns out that in most cases, an equal balance of the sexes is the evolutionary stable strategy.

Aired: 02/21/18
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Watch • 14:52
Be Smart
The Intelligence Test Where Ants Beat Humans
How thousands of tiny brains, obeying simple rules, solve problems no individual can understand.
Episode: S13 E17 | 14:52
Watch • 19:50
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Joe visits a flavor lab to uncover how our senses shape our taste.
Episode: S13 E16 | 19:50
Watch • 20:05
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Here is the REAL science about "alpha males."
Episode: S13 E15 | 20:05
Watch • 22:36
Be Smart
Inside the Vault Where They Keep the Dinosaur Apocalypse
How did the mass extinction of the dinosaurs play out, moment by moment?
Episode: S13 E14 | 22:36
Watch • 12:37
Be Smart
(Almost) Everything You Learned About Genetics Is Wrong
Think traits like eye color or tongue-rolling are simple genetics? Think again.
Episode: S13 E13 | 12:37
Watch • 11:08
Be Smart
Mars Used to Be Blue... Then Something Happened
Why is the Martian sky red by day… but blue at sunset?
Episode: S13 E12 | 11:08
Watch • 36:47
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Is autism really on the rise—or are we just recognizing it more?
Episode: S13 E11 | 36:47
Watch • 14:51
Be Smart
Why Seedless Fruit Is a Disaster Waiting To Happen
Seedless fruits are delicious, convenient… and completely unnatural.
Episode: S13 E10 | 14:51
Watch • 21:13
Be Smart
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What does randomness really mean? And why your digital life depend on it?
Episode: S13 E9 | 21:13
Watch • 16:20
Be Smart
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Why do we have different blood types? And why do we have blood at all?
Episode: S13 E8 | 16:20