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What exactly are you eating when you bite into that cheeseburger or potato chip? You might be surprised. We interview "The Hair Detective," Dr. Stephen Macko, to find out how the food you eat shows up in your hair.

As many as one-third of the world's coral reefs may be headed toward extinction. A new study blames the destruction on a range of culprits, from fishing boats to climate change.

What role will conservative women play in this year's presidential race? SDSU Political Scientist Ronnee Schreiber examines the rise and power of the conservative women's movement in her new book: "R

Last spring, experts thought it was possible swine flu would kill 1 out of every 100 people who got the virus. But the death rate so far is around 1 out of every 2,000. The CDC says the number of children who've died is troublesome, however, and worries if people think the threat is over, they'll be less likely to get vaccinated.

Authorities in the United Kingdom say they have arrested more than 20 people in a terror plot to plant bombs on airliners headed to the United States. Police say the suspects were planning to carry liquid explosives onto as many as 10 planes, and detonate them in mid-air. Experts and callers look at the science behind the alleged plot.

NASA has invited education institutions, museums and other organizations to request artifacts from the soon-to-be-terminated program. The giveaway includes a massive amount of equipment from the program's nearly 30-year run.

A new report from the National Academy of Sciences says the honey bees that pollinate billions of dollars worth of farm crops are in decline. That could spell trouble for the farm economy.

Voters will decide whether to repeal the state's gay marriage law next month. While the latest poll gives an edge to same-sex marriage supporters, opponents aren't backing down. They say the law will result in gay marriage being taught in public schools. Campaign organizers from both camps expect a close race.

There is a growing body of research connecting happiness to volunteerism and contributing to something that is bigger than yourself. In many cases, that means giving to charitable organizations. We discuss why people give and what draws us to give to one group over another.

Scientists in Oregon have developed a technique that could be used to prevent certain genetic diseases. They've demonstrated it in monkeys and are anxious to try it in people. The technique raises ethical questions, however, because it makes a permanent genetic change not just in an individual, but in all generations that follow.