Cue the theme song to the Twilight Zone: Research shows your plants won't grow as well when you're depressed as when you're happy. Praying for someone else will improve your own health, too. The growth of E. coli bacteria is inhibited when a group of people merely think about stopping the growth. And qi gong practitioners in San Francisco can kill cancer cells in other peoples' bodies--by willing the cells to die. These ideas surely sound ludicrous, but these and other similarly mindboggling studies have been commissioned and replicated by researchers at Harvard, Duke, McGill, and other esteemed universities.