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

Only Available in Archive Formats.
The Year in Scientific Backtracking

The Year in Scientific Backtracking

The Year in Scientific Backtracking

Only Available in Archive Formats.

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)