BPY elementary school scientists have been doing the work of dendrochronologists. They have dated tree stumps by counting rings, they have learned to tell the history locked in tree rings, like the amount of rainfall, injuries from insects, birds, fire and growing on a slant. They even predicted the amount of rainfall in the past by measuring the width of rings. Dendrochronologist Brita Lorentzen visited via Zoom from her lab in Cornell to share her research stories. She showed students her tools and shared photos from research sites all around the world.