The renowned cave diver takes readers on “a thrill ride into unfamiliar worlds”—exploring the hidden depths of our oceans and sunken caves (Publishers Wee

The Huautla in Mexico is the deepest cave in the Western Hemisphere, possibly the world. Shafts reach skyscraper-depths, caverns are stadium-sized, and sudden f

"Every pebble has many stories to tell. Its particular atoms, its crystals, its minerals, its grains, its textures, its strata, its tiny fossils bear evidence t

An inside tour of the incredible—and probably dangerous—plans to counteract the effects of climate change through experiments that range from the plausible

Today, the training of American astronauts is almost taken for granted, but prior to 1961 no one knew whether humans could function in space at all. Space suits