Methane rising to the surface of lakes
Methane bubbles trapped in ice: Here is why this phenomenon observed in the world's coldest regions is both stunning and worrisome.
Somewhere in California lives the world's oldest tree
General Sherman: the largest living organism in the world
3 of the most beautiful beaches in the world
Indonesia: this is the largest highly acidic lake in the world
New Mexico's striking Carlsbad Cavern
Japan's mysterious glowing squid