Lichen on Yosemite icons key to pollution studies
Wednesday, September 24, 2008 - 02:49
in Paleontology & Archaeology
YOSEMITE NATIONAL PARK, Calif. (AP) -- After exploration by millions of visitors over the past 100 years, it's hard to imagine anything left to discover amid the majesty of Yosemite's glacier-cut granite cliffs and giant Sequoia groves....