Hi, you're about to get smarter in just a few minutes with Curiosity Daily from

Curiosity.com. I'm Cody Goff. And I'm Ashley Hamer.

Today author Bill Sullivan is back to talk about the surprising ways a person's genes can influence aggressive and

violent tendencies.

You'll also learn about how it's possible that anglerfish can fuse to their mates and

a Navy SEAL technique for reducing stress and staying calm.

Let's satisfy some curiosity.

There are a ton of invisible factors that influence your behavior.

You don't really have much control over your DNA or the germs you come into contact with,

but they're helping to shape who you are and what you do.

If you don't believe me, then you really need to hear this

conversation we had with Bill Sullivan. He's a professor of pharmacology and

toxicology at Indiana University School of Medicine and author of the new book,

Pleased to Meet Me, Genes, Germs, and the Curious Forces that make us who we are.

In the book, he explains how genetics, epigenetics, microbiology, and psychology work together to influence our personality and actions.

So we asked him, out of all the unseen forces that can affect someone's behavior, what do you think is the most surprising?

One of the biggest ones that surprised me was probably aggression and violence.

That is something that I thought was completely

in the realm of someone's mind,

in their realm of control.

You're either a good person or you're a bad person. You're either

peaceful or you're violent and that's kind of you know on you. But there have been in fact studies that suggest variations in certain genes that control

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