By Graeme Stemp-Morlock Puzzle Me This VisualField / ISTOCKphoto.com What substance is supposed to have no effect but can make people feel better, has no chance for a big monetary payoff but is worth billions, and is used in virtually every rigorous clinical trial but has no single, universal formulation? The answer is the placebo. Hallmarks of good biomedical research, placebos are used throughout the world in double-blind, randomized controlled trials. A

What substance is supposed to have no effect but can make people feel better, has no chance for a big monetary payoff but is worth billions, and is used in virtually every rigorous clinical trial but has no single, universal formulation? 

Darwin, ha ha By Graeme Stemp-Morlock "Charlie's Angels": students pose with a Darwin figure. Courtesy of Colin Purrington The evolution of every living organism on the planet—with all its social, religious, and scientific ramifications—might not seem like a laughing matter. But to many scientists, it is. One scientist who has given evolution something to sing about is Richard Milner. The author of "Darwin's Universe: Evolution