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Where Did Life Come From?

Where Did Life Come From?

Season 6 Episode 9
12:46
How Your Memory Works

How Your Memory Works

Season 6 Episode 11
8:19
Why Do We Itch?

Why Do We Itch?

Season 6 Episode 12
4:59
Where Did Earth's Water Come From?

Where Did Earth's Water Come From?

Season 6 Episode 14
4:13
The Science of Farts

The Science of Farts

Season 6 Episode 18
5:07
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It's Okay to Be Smart

Why Are There As Many Males As Females?

Season 6 Episode 5

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.