The Year in Scientific Backtracking This year, scientists issued a steady stream of retractions, reversals, and reassessments. For example: hormone pills don't protect against disease; the food pyramid doesn't make sense; and a common knee surgery is a waste of time. NPR's Christopher Joyce reports. (5:30)
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The Year in Scientific Backtracking

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The Year in Scientific Backtracking

The Year in Scientific Backtracking

The Year in Scientific Backtracking

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  • <iframe src="https://www.npr.org/player/embed/898175/898176" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

This year, scientists issued a steady stream of retractions, reversals, and reassessments. For example: hormone pills don't protect against disease; the food pyramid doesn't make sense; and a common knee surgery is a waste of time. NPR's Christopher Joyce reports. (5:30)