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U.S. optimism lags behind economic gains, study finds

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PBS News Hour

Debunking the ancient Paleo Diet in modern cultures

Regarding the world's swelling population, the September issue of National Geographic examines the Paleo Diet as a way to feed the planet's future generations and offers a more complete look at what our ancestors really ate. Science writer Ann Gibbons joins Hari Sreenivasan to discuss how the real Paleo Diet varies among cultures. 
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