In honor of Banned Books Week, here are the top 10 challenged books of 2013.

This is the second year Dav Pilkey’s Captain Underpants series has topped the list. He tells NPR’s Lynn Neary:

“I don’t consider the books to be anti-authoritarian, but I do think it is important, if you think something is wrong, to question authority — because, you know, there are villains in real life, and they don’t always wear black capes and black hats. Sometimes they’re dressed like authority figures. And kids need to know that it’s important to question them.”

When it comes to books, we may not all agree on what makes for a good read – but I hope we can agree that letting children choose their own books is crucial to helping them learn to love reading.

Dav Pilkey, author of the Captain Underpants series, in an essay for The Guardian

Letting students select their own books is a central part of our BookUp program. You can learn more about it here.