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February 8, 2013 At its closest approach, the office building-sized asteroid will be only about 17,200 miles above the surface of our planet. That's far nearer to us than the moon, and even closer than some weather and communications satellites. Some people think this near miss should serve as a wake-up call.

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On Morning EditionPlaylist

February 7, 2013 When salmon are ready to leave the ocean and go back to their birthplace, they use magnetism to find their home river. But scientists fear fish born in hatcheries might have a poor sense of direction if they're raised in places surrounded by man-made objects that drown out the planet's natural magnetic field.

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February 7, 2013 Obtaining the materials to make weapons-grade uranium or separated plutonium is harder than making a nuclear weapon, experts say. That's why the U.S. is engaged in a global effort to try to keep the specialized products out of hands it deems dangerous, like Iran.

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February 7, 2013 What killed the dinosaurs? It's history's ultimate murder mystery, and for decades the prime suspect has been a giant asteroid. New data suggest that it struck right before the extinction. But scientists say it still may not tell the full story of what happened to the dinosaurs.

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February 7, 2013 A team of researchers from the British Antarctic Survey stumbled upon some interesting satellite images in 2009: a trail of penguin poop that showed signs of a huge colony of emperor penguins. A team of researchers finally made it out to visit the 9,000-strong colony last December, marking the first human contact the animals had experienced.

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On Talk of the NationPlaylist

February 7, 2013 Take a boot, take a glove, take a brick, take a pan, take a car roof, spray it with this new nano-tech substance and strange things will happen. Very strange things.

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February 7, 2013 Regulations to restrict the amount of silica dust that workers can inhale were set decades ago, and workplace safety experts say that limit needs to be cut in half. A proposal for new rules was sent to the White House Office of Management and Budget for a 90-day review, but almost two years later, it's still under review.

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February 6, 2013 President Obama has ordered an end to a 16-year-old ban on federal funding of research on guns and health. But the political controversy that led to the ban in the first place is far from over.

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February 6, 2013 There's nothing better on a cold day than a warm bowl of soup. But when did our ancestors first brew up this tasty broth? New archaeological evidence suggests that soup making could be tens of thousands of years old.

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February 6, 2013 APRNWreckage believed to be from the 2011 Japanese tsunami is washing up thousands of miles away in Alaska. The debris isn't just unsightly — it poses environmental worries for the landscape and animals. One conservationist says the problem may be worse than the Exxon Valdez oil spill.

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February 6, 2013 Building your own stuff boosts your feelings of pride and competence, and also signals to others that you are competent. As a result, most of us believe we labor on things we love. Now, psychologists are asking if it is the other way around — is it labor that leads to love?

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February 5, 2013 A study finds that guys who watched a lot of TV had lower sperm counts than more active fellows. The effect held true even when other factors, such as body weight and diet, were taken into account.

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February 5, 2013 Spielberg's were big, green and scaly. The real ones? They were often rosy, yellow, orange, iridescent, covered with fuzz, plumes, or feathers. Take a look at this latest take on the Jurassic, when reptiles, we think, looked more like rainbows.

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February 4, 2013 Many of them have cut out smoking, and rates of heart attack and emphysema have declined. But baby boomers are burdened with diabetes, hypertension and many other chronic conditions. Researchers say too little exercise and a rise in obesity threaten baby boomers' golden years.

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