They can make us alert, relaxed, creative - and addicted. There's a broad spectrum of psychoactive substances, from coffee to heroin and LSD. Despite the risks they're consumed around the world. Researcher Dr. Andrea Zeuch explains how drugs can be used in a responsible manner, and why banning them doesn't help. Plus: is fat healthier than you think?
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We'd all like to have strong, white teeth. But many of us hate going to the dentist - and avoid it come what may. Also: Stem cell transplants for leukemia patients, and remedies for stomach complaints.