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For decades, the U.S. government’s dietary guidelines have warned Americans off eggs and other cholesterol-rich foods on the theory that dietary cholesterol increases one’s risk for heart disease. But last week, Americans woke up to a new egg paradigm. According to the nutrition experts on the government’s Dietary Guidelines Advisory Committee, cholesterol is no longer a “nutrient of concern.” In fact, if they have their way, the government’s new dietary guidelines won’t include any prohibition against cholesterol at all. Why the reversal? Ira discusses the latest science on cholesterol and fat with the Harvard School of Public Health’s Walter Willett and the Cleveland Clinic’s Steven Nissen.

After Decades of Dietary Warnings, Eggs Make a Comeback

Ryan Rykaczewski describes one of the most massive migrations on the planet, driven by the sun. Image by Tintinnidguy (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons 

#ExplainTheSun  - The Largest Migration on The Planet

Once, there was the ordinary incandescent light bulb. It shone brightly, but wasted much of the energy put into it as heat. Then came the compact fluorescent. And as costs have dropped, consumers have increasingly been switching to light-emitting diode (LED) technology for many lighting applications, in an ongoing search for a more efficient bulb. Now, in work published in the journal Nature Nanotechnology, researchers report that nanophotonic devices may be able to breathe new life into old incandescent technology. Marin Soljačić and Ognjen Ilic, two authors of the study, explain how they’ve been able to “recycle” some of the incandescent bulb’s wasted heat and re-emit it as visible light, boosting efficiency.

For the Lowly Incandescent Bulb, a Ray of Hope

Science, technology, and other cool stuff from public radio's Science Friday. It's brain fun, for curious people. From WNYC Studios.

After Decades of Dietary Warnings, Eggs Make a Comeback

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