California is a great place for spelunking -- aka exploring caves. While you might think one cave is like another, each one ...

From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to ...

Astronomers thought they had seen the "first hints of life on an alien world" this year, but they disappeared under closer ...

The longer I spend in Madagascar, the harder I find it to keep my bearings, stick to the matter-of-factness of global ...