Image credit: Stefan Kühn Before we go, I have a new mystery for you. Researchers, with permission, took a small sample from the altar stone at Stonehenge and examined its composition and structure in a new level of detail. This information made it possible to determine the stone is 1000-2000 million years old, and chemically similar to rocks in the Orcadian Basin of Scotland. This research was a bit of a surprise to everyone because it had been assumed that this stone, like others, came from Whales.  Stonehenge was built about 5000 years ago in Southern England. With one exception, it...