Mr. R.’s World of Math

So here’s a story you’re probably not gonna’ believe, but it’s true. I promise you! At least I remember it happening…

It was a long time ago, when I was teaching in a school that was a bit strange, and a bit peculiar (but not nearly as peculiar and strange as the school you’re in right now!)

As I remember, it was a cold, dark morning, and I came into my classroom like I always did. Everything was perfectly normal and there was no way I could have imagined what was going to happen to me and my students that very strange day.
It was a special day because we had a special guest science teacher scheduled to visit the class.
Morning meeting had just ended when she showed up. She introduced herself to the class as Ms. Curie, then she smiled and said, “Some people like to call me Madame Curie, and others call me Madwoman Curie.”
The students gave her a warm welcome, before she asked the students if they liked biology.
“I love biology,” screamed Matthew, “I love making chemicals go kaboom!”
“Um, I think that’s chemistry, you’re talking about,” said Jenna.
“Anyway,” said Ms. Curie, I’m going to do some hands-on biology experiments that I’m sure you’ll enjoy.” Then she asked for a volunteer.
Regina raised her hand and came up to the front of the classroom.
“Are you ready?” asked Ms. Curie.
“I guess so,” said Regina.
Ms. Curie told Regina to close her eyes, then she pressed what looked like a little laser into Regina’s arm.
“Hey, don’t give Regina a shot!” yelled Matthew.
“No,” said Ms. Curie, “it’s just a little lasery light thingee I’m shining on her.”
A second later, we saw Regina start to glow and she began spinning around really fast like a top!
“What are you doing to her!” yelled Jake in fear.
Ms. Curie was smiling a strange smile as Regina spun around faster and faster. 
“Ms. Curie?” I asked, “Are you sure this is a safe experiment?”
“Of course it is,” she smiled, “I’ve been doing these demonstrations for years.”
When Regina stopped spinning we couldn’t believe our eyes. We were shocked and appalled by what we saw.

If 13 out of the 20 people in the classroom were more shocked than we’ve ever been, what percentage of us were more shocked?