An incredible well manages to turn everything into stone. Here's how and why it happens ..
There is a truly strange and unique place in the world: it is a well that manages to transform any object into stone. It is located on the banks of the River Nidd in North Yorkshire.
Anything that comes into contact with the dripping rock turns to stone within a few months. Visiting it you can find leaves, sticks, dead birds, all petrified.
Over time some people have also tried to leave various everyday objects to see them turn into stone. For a long time it was believed that the well was cursed, not least because of its strange skull shape seen from a certain angle.
In fact, scientists have shed light on the mystery: water contains a very high content of minerals, including calcite. This creates a coating around the objects the water touches. Prolonged contact therefore creates a kind of shell