Up Next
Back to Show
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.
Support Provided By
10:52
Celebrating 30 years of the Hubble Space Telescope.
12:19
Do the supposed advantages for springing forward and falling back hold up?
8:23
The sunlight we see is tens of thousands of years old. How is that possible?
11:30
I went to NASA in Houston to talk to astronaut Don Pettit.
7:20
Why is ice slippery? It's a more complicated answer than it seems!