Salt is one of those dangerously tasty substances. We add the magical crystals of sodium chloride to almost everything that we cook or bake, and according to many public health experts, we add too much.
They want us to cut back, to lower our risk of heart attacks or strokes.
Yet when you really start looking for ways to do this, you run into a paradox and a scientific puzzle.
First, the paradox. Too much salt may kill us, but our bodies need some of it to survive.
According to countless prophecies, terrorizing people across the world, this will be my last contribution to 13.7. On Friday, December 21, the world will come to an end. I have been receiving dozens of concerned email messages from otherwise reasonable people, convinced that this time it is for real, that there is no escape.
It was three, maybe four o'clock in the morning when he first saw them. Grad student Jeff Bowman was on the deck of a ship; he and a University of Washington biology team were on their way back from the North Pole. It was cold outside, the temperature had just dropped, and as the dawn broke, he could see a few, then more, then even more of these little flowery things, growing on the frozen sea.
On Tuesday, the National Institutes of Health in Maryland is holding a second day of talks about whether and how to continue funding some controversial scientific experiments.
Back in January, virologists agreed to temporarily stop research that was creating new forms of bird flu because critics argued that the work was too dangerous. NIH officials are now seeking input from scientists and the public about how to proceed.
At about 5:30 p.m. on Monday, two washing machine-sized space probes crashed into the surface of the moon. It was all by design and marked the end of NASA's GRAIL mission. The two probes had been orbiting the moon for almost a year, and they've sent back data that have given scientists an unprecedented look inside our nearest solar system neighbor.
From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.
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And I'm Melissa Block.
Mount Everest is a symbol of excellence and of danger. The world's highest peak means success to mountaineers. And it's also, according to filmmaker David Breashears, a canary in the coalmine of climate change. Breashears has just returned from a trip to Nepal where he's been gathering extraordinary images of Everest's retreating glaciers.