Giant gypsum crystals -- some of which are in excess of 30 feet long and half a million years old -- are found deep within the Naica mine in Chihuahua, Mexico and are renowned for their spectacular beauty.
Square, straight and ringlike ditches scattered throughout the Bolivian and Brazilian Amazon were there before the rainforest existed, study finds.
The mysterious spirals are in fact an environmental art installation.
The active search for the long-lost bird of science and myth -- the ivory-billed woodpecker -- is officially ending. At least it is for the Cornell Lab of Ornithology. "The preliminary conclusion we've come up with at this point is that it's unlikely that there are recoverable populations of ivory-...
A UFO was sighted during the opening ceremony at the London Olympics. What was it?