Where do natural pigments come from?
Squid ink to make sepia, cochineal to make red... Nature offers a wonderful range of colours.
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