The Library of Congress has a research section dedicated to Everyday Mysteries. Dealing with topics like “What is the difference between sweet potatoes and yams?" and “Why do fingers and toes wrinkle in the bathtub?", the site contains serious answers to fun questions, a nice diversion from the typically staid offerings of the world’s largest library and the U.S.’s oldest federal cultural institution.

http://www.loc.gov/rr/scitech/mysteries/