But why do we need vitamin D—and why is the advice ... and immune defenses against bacteria and viruses, according to the National Institutes of Health’s Office of Dietary Supplements.

To honor Koko's memory, National Geographic is republishing "Conversations ... then she is exploiting language the way we do as human beings. Certainly that is linguistic, though perhaps not ...

U.S. News Insider Tip: While in Los Alamos, don't miss the Bradbury Science Museum, which showcases the history and work of Los Alamos National Laboratory ... is another must-do hike.

There are two beaches and a few restaurants situated within the 44-acre national landmark, as well. You'll find the landmark on the northwest tip of the island, near Gros Islet and Rodney Bay.