What Is a Healthy Diet? The Answers Are Unsatisfying
In the 1960s and 1970s, doctors pointed to two likely culprits for the country’s heart disease epidemic: dietary fat and cholesterol. Much of the country tried to avoid fat at all costs. But did the low-fat recommendation help or hurt? And why is nutrition still so controversial?
Bliss Point: How Food Companies Make Us Crave Their Products
How did food companies get us to crave their products? They discovered the "bliss point."
Is the Key to Obesity All in Your Gut?
Is there a hidden cause of obesity? A professor at Stanford thinks the answer might lie with the 100 trillion microbes living in our bodies.
The Unexpected Science of Exercise
Does exercise really make you lose weight? One scientist went to Africa and found an unexpected answer.
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Where the Debate Over "Designer Babies" Began
Genetic technology is advancing, and critics are warning of a slippery slope. We spoke with the scientists working at the forefront of the research, families who have benefited and the first-ever "test-tube" baby to understand the debate.
Nuclear Power's Public Opinion Rollercoaster from Three Mile Island to Fukushima
More than three decades after the accident at Three Mile Island cast a shadow on the atomic dream, is America again ready to give nuclear energy a chance?
Flawed Evidence: The Limits of Science in the Crime Lab
Before DNA testing, prosecutors relied on less sophisticated forensic techniques, including microscopic hair analysis, to put criminals behind bars. But how reliable was hair analysis?
Biosphere 2: A Faulty Mars Survival Test Gets a Second Act
NASA isn't the first organization to experiment with living on Mars -- in 1991 eight people sealed themselves inside a giant glass biosphere to practice space living. By the time they emerged two years later, they had "suffocated, starved and went mad."