Thousands of feet below the surface lies a world that looks more like an alien planet than Earth. Towering glass sponges, ...

Are aliens real? Was Fox Mulder right all along? We examine the prediction markets to gauge if the U.S. government will confirm that aliens exist before January 2029. The prediction market on a U.S.

Originally published in the January 1970 issue of National Geographic. In remote African highlands, a daring American woman ...