Jessica Wynn

Her hormones change.

So, yeah, there's a lot of little factors that determine our chemistry.

Yeah, it's believed to some extent they can.

So after birth, genetics team up with environment.

Cultural factors start to matter and kids imitate what they see, their parents, teachers and siblings, what they're all doing.

Yeah, I mean, it's possible, but the spinal cord itself shows left-right differences early on, and that indicates what babies see and imitate.

That's how it all gets reinforced.

So for centuries, society has been biased towards right-handedness, and that can matter for some people.

Some schools force kids to switch to writing with their right hand, even if they favor the left naturally.

I mean, that was literally my experience.

Second grade, Sister Collins.

I look back and really think she feared me and thought I was some kind of devil's intern.

I had red hair.

I was left-handed.

She made me stay after school to practice writing with my right hand.

And the results looked like...

crooked, out of control penmanship, like a ransom note or something.

It wasn't long after that I was politely asked to switch to a public school because I was so devilish, I guess.

I know.

They just lots of hatred.