This episode features:

-How do humans detect cheaters?

-Can you tell how generous someone is by the way they look?

-What is the #1 rated most desirable trait in a long-term mate?

-What does Maury Povich teach us about human nature?

-Why is your mother's mother your nicest grandparent?

-Why do mothers invest more in their children compared to fathers?

-Why would somebody donate their kidney to a stranger?

-Are humans selfish?