Dava Sobel is an American writer of popular expositions of scientific topics. Her books include Longitude, about English clockmaker John Harrison; Galileo's Daughter, about Galileo's daughter Maria…
Ethan Gallogly, PhD (“Panda Po”) has been a leader in the Sierra Club, the Cal Hiking and Outdoors Society, the Outdoors Club of Southern California, and the Davis Hiking & Backpacking Group. His boot…
