There are 8 sets of twins and one set of triplets at Byron Elementary.

Wednesday, they were read to by a very special set of twins.

Marilyn Erbentraut and Carolyn Rath wrote a book, "I Am a Twin! Me, Too."

They read to almost 20 children at Byron Elementary School.

The book is designed to help children know what twins are.

It can be used as an educational tool for parents, too.

But one thing Marilyn and Carolyn want kids to know is it's about friendship.

"I think we're also best friends, so in addition to being twins, we're also each other's best friend and we always have been."

About 3 out of every 100 children born in the U.S. are twins.