Is health news helpful or just hype?

Knowing the basics of scientific research and statistics can help you understand what medical studies really say

In the late 1990s, word that selenium and vitamin E might lower the risk of prostate cancer was reported by newspapers and magazines, broadcast on television and radio, and announced on Web sites. Eager to prevent the disease — and convinced that vitamins and minerals couldn't be harmful — men around the world began taking the supplements.

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