Do Clean Athletes Have a Chance?

Anti-doping expert Werner Franke discusses whether clean athletes can ever really compete with cheaters, and the chances of catching a doper

Why Do Women Live Longer Than Men?

Tom Perls, an aging expert at Boston University, explains why women live five to 10 years longer than men

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How Bad Are iPods for Your Hearing?

Expert Brian Fligor discusses the damage from personal audio devices and how to prevent it

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When Are You Most Likely to Have a Heart Attack?

Our circadian rhythm plays a crucial but little-known role in heart attack risk. The most dangerous time of day for your heart may surprise you

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Which Are Worse: Calories from Carbs or Fat?

Harvard professor and nutrition guru Walter Willett says a calorie is a calorie — and a diet that cuts either should work equally well

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Why Are People Taller Today Than Yesterday?

Is a population's height governed by genes or diet? TIME asks John Komlos, a University of Munich historian and economist

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Is the Damage from Smoking Permanent?

Quitting cigarettes can only do a body good, but do former smokers ever fully recover from years of addiction?

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Why Do We Remember Bad Things?

TIME asks MIT professor Matt Wilson why emotionally charged memories stick with us longer than the mundane

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How Much Does Animal Testing Tell Us?

New drugs are routinely tested on mice and other animals before humans. But why are some results translatable to humans and some not?

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How Much Sleep Do You Really Need?

Sleep expert Daniel Kripke reviews the research and says 8 hours is not necessarily best for all

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Prozac Over the Counter?

TIME asks a prominent bioethicist whether antidepressants should be more widely available

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Can Alzheimer's Be Prevented?

Walter Kukull, of the U.S. National Alzheimer's Coordinating Center, talks about what causes the disease and how researchers could reduce people's risk

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