It's spring in Geneva when the secretary general of the cantonal parliament sees the first leaf on the city's official horse ...

Sunlight filtered through the overstory of a thick Pennsylvania forest and a few rays fell upon the long, serrated leaves of the American chestnut trees down below. The higher Mike Manes ...

From left to right, the trees are a blight-susceptible wild-type American chestnut (C. dentata) called Ellis 1, a blight-resistant Chinese chestnut (C. mollissima) tree called 'Qing,' and two ...