Finding the pot of gold at the end of the rainbow

This is a photo of a chalcedony interacting with white Tungsten light. It is special because it almost shows all the colours of a rainbow. To do so, the crystal needs to have the exact geometry and to be placed at the exact position to interfere with each of the colours separately.

Ants, the world’s barely visible largest biomass

Ants are a group of colony-forming social insects, which belong to the order of Hymenoptera. Ants have been able to adapt to very different habitats; where they occur, ants are the dominant life form on the bottom. It is estimated that the total biomass of ants is greater than that of any other animal species on earth.

Just stones?

Tumbled stones are small pieces of rocks and minerals (usually about one to five centimeters in diameter) that have been processed in a rock tumbler to produce smooth, rounded and highly polished pebbles. Most stones that a person can find will not tumble with good results. The rocks and minerals used to make tumbled stones are specially selected for their color, translucence, appearance and ability to