The tallest redwood tree in Muir Woods — a giant that was assumed to have sprouted up to 1,500 years ago in the Middle Ages — is a measly 777 years old, a puerile sprig in the hallowed halls of old growth, an analysis of tree-ring data has revealed. The study, by a Humboldt State University scientist, is the first definitive determination of the age of trees in Muir Woods. The findings by Allyson Carroll, a tree-ring specialist, mean that a 249-foot-tall coast redwood known by the lackluster name of Tree 76 sprouted seven centuries later than originally believed, at...