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It's the first launch since a Falcon 9 rocket exploded in June, and the first recovery of a spent booster for SpaceX. Previous attempts were close but ended in failure.

Everyone has a set of genes that keeps the body on a 24-hour rhythm. As we get older, though, the main clock can malfunction. Researchers say a backup clock may try to compensate.

A disc jockey in Austria locked himself in a studio and played "Last Christmas" 24 times in a row. He said people weren't in the Christmas spirit and he wanted to change that.

The Iraqi military has encircled the city since last month. Now, with U.S. air support, it's pushing into the ISIS stronghold in the city center.

Fashion models feel pressured to be dangerously thin, and France has passed a law to fine fashion houses for hiring underweight models. Researchers say it's a workplace health issue in the U.S., too.

It's hard for anyone to get enough of the sunshine vitamin in the wintry North, and dark-skinned teens may be especially prone to a deficiency, doctors find. A weekly supplement can help.

Turns out the tradition of leaving cookies and milk for Santa hasn't left much of a trail of crumbs to trace through history. But it might start with the early cookies of 13th-century Europe.

In some fancy hotels, Christmas tea has become a refined respite for harried shoppers. But the tradition's roots are much rowdier: efforts to fight public drunkenness.

As you might have guessed, the answer is not Tanzania. So the holiday season is a good time to reflect on ... electricity.

When unemployment is high, school districts have very little trouble finding drivers. But low unemployment spawns an exodus. In Nashville, Tenn., the needs are especially pressing.