Dr. Jared Ross is a shower fanatic. The temperature where he lives in Charleston, S.C., recently reached the steamy triple-digits—and he coped by hopping under a nice, cool deluge of water four times ...

For a while vitamin D was looking like a bona fide health elixir. It was recognized a century ago as the cure for rickets, a childhood disease that causes weak and deformed bones. Then, in the early ...