Kids love trees. How do we know? They send us a LOT of questions about our bark-wrapped friends.

How do trees make oxygen? How do they grow? How do evergreens stay green all year? Why do tree leaves change color? How long can trees live? We’re branching out to tackle all these questions + we drop in on the world’s oldest tree.

Brains On! is an award-winning audio show for kids and families from American Public Media.