Meet Tristin and Tyler, 8-year-old twins and the hosts of the web video series Tristin & Tyler’s Tales from the City. They’re out to save the Earth one project at a time, and have a fun, new challenge for KIWI Kids: Be a book buddy! Take books that you’ve outgrown and read them to a younger child. It’s a fun way to do something nice for someone else—and be a good role model.

Check out Tristin and Tyler’s video below to see how you can get started as a book buddy.