Summary: What would happen to earth if the entire human population disappeared over night? Dr Stephen Baxter predicts; Does homeopathic medicine really work? Former physicist Simon Singh tries acupuncture; Discover the truth about sex in space.
Summary: What would happen to earth if the entire human population disappeared over night? Dr Stephen Baxter predicts; Does homeopathic medicine really work? Former physicist Simon Singh tries acupuncture; Discover the truth about sex in space.