Science

The Salt
4:01 pm
Thu February 7, 2013

Animal Magnetism: How Salmon Find Their Way Back Home

Bright red sockeye salmon swim up the Fraser River to the stream where they were hatched.
Current Biology, Putman et al.

Originally published on Fri February 8, 2013 1:50 pm

Before they end up filleted and sautéed on your dinner plate, salmon lead some pretty extraordinary, globe-trotting lives.

After hatching in a freshwater stream, young salmon make a break for the ocean, where they hang out for years, covering thousands of miles before deciding its time to settle down and lay eggs in their natal stream.

So how do these fish find their way back to their home river?

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Science
3:19 pm
Thu February 7, 2013

Fresh Clues In Dinosaur Whodunit Point To Asteroid

Scientists have confirmed that the impact of a giant asteroid and the mass extinction of the dinosaurs happened at the same time.
Courtesy of Don Dixon/cosmographica.com

Originally published on Thu February 7, 2013 6:53 pm

Some 66 million years ago, about 75 percent of species on Earth disappeared. It wasn't just dinosaurs but most large mammals, fish, birds and plankton. Scientists have known this for a long time just from looking at the fossil record. If you dig deep enough, you find lots of dinosaur bones. And then a few layers up, they're gone.

But scientists couldn't figure out exactly what had caused this phenomenon. Of course, there were lots of theories.

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Krulwich Wonders...
11:37 am
Thu February 7, 2013

Next Time Your Mom Says Don't Go Out in The Rain, Spray Yourself With This

YouTube

Originally published on Thu February 7, 2013 11:38 am

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Shots - Health News
2:31 am
Thu February 7, 2013

Silica Rule Changes Delayed While Workers Face Health Risks

A worker makes a cut in the side of a sandstone block at the Cleveland Quarries facility in Vermilion, Ohio, earlier this month. The legal limit on the amount of silica that workers can inhale was set decades ago.
Ty Wright Bloomberg via Getty Images

Originally published on Thu February 7, 2013 2:07 pm

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Shots - Health News
3:36 pm
Wed February 6, 2013

Debate Rages On Even As Research Ban On Gun Violence Ends

More than 400 guns, including these three, were turned in during a Dallas gun buyback program in January. But determining the effectiveness of such programs is difficult due to limits on gun-related research.
Tom Pennington Getty Images

Originally published on Wed February 6, 2013 5:12 pm

The characteristics of gun violence in the U.S. are largely unknown because key federal health agencies have been banned from conducting such research since the mid-1990s.

President Obama, however, wants to change that.

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