How old is the oldest tree?

Ever wondered how trees keep track of time? They don’t wear wristwatches, so…do they have a tree calendar? Or count their rings like candles on a birthday cake? We asked arborist Casey Clapp to help us find the answer. Got a question that’s budding in your mind? Send it to us at BrainsOn.org/contact, and we’ll help sprout the answer! See omnystudio.com/listener for privacy information.