The American chestnut is functionally extinct in North America. A new festival looks to celebrate the chestnut's history and raise awareness about its recovery efforts.
Vultures have such bulletproof digestive systems they can even eat anthrax. But their powerful stomachs also serve an important environmental function.
An event focused on interactive public art led a group to Turtle Cove along the Allegheny River. Participants collected trash and constructed sculptures.
