Your Brain's Secret Attraction Test🤯

This is gross, but it's true. [music]

When you're with someone and you

physically touch, the reason you're

physically touching is you're trying to

[music] produce oxytocin, but also you

really want to smell them. [laughter]

There was a fantastic [music] study that

looked at this and what they did is they

videotaped strangers shaking hands. So,

we can shake hands.

>> And what they found was within the first

few seconds after shaking hands, people

without realizing it [music] touched

their own nose, swiped it, itched it.

why their brain was actually trying to

smell what were the chemicals

>> that you just gave me because we like

people with different immune [music]

systems than us. Well, nature needs to

make sure that you don't feel attracted

to your sibling. And even if [music]

they're good-looking, what are they

going to do? Like, how do you make sure?

Exactly. And so, you're kind of like,

are you a cousin? Uh-huh.

>> [laughter]