Schering and Merck have defended the drugs by pointing to the mountains of evidence that support the idea that lowering low-density lipoprotein, commonly known as LDL or "bad cholesterol, " prevents heart attacks.

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Loss of density makes hair harder to style because the hair doesn't support itself as well, says Kevin Mancuso, creative director at Nexxus.

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For example, the density of wood in a palm tree trunk varies, depending on the load it must support.

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