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Getting serious about helping without hurting

It could wreck your immune system. Or save your life

Study adds wrinkle to fasting-longevity research

Why does the muscle fail?

Probing the puzzles of death and disease

Rare sheep could be key to better diagnostic labs in developing world

Cancer's ultimate source

How the other 90 percent of your brain works

The mitochondria detective work gets a little easier

A Q&A with Tess Gerritsen, medical mystery writer