Before the turn of the last century, more than 4 billion American Chestnut trees—some 120 feet tall and 15 feet in diameter—dominated the Eastern woodlands. In 1904, the Asian fungus responsible for their demise was discovered at the Bronx Zoo, and in just 30 years almost every one of the majestic trees was gone. Now, after years of research and cross-breeding, scientists with the American Chestnut Foundation are raising thousands of blight-resistant trees in eastern Ohio. Check out the full story here.