A 200-ft diameter crop circle has turned up in a wheat field right next to the famous ancient monument, Stonehenge, prompting questions as to who is responsible. Some believe crop circles are elaborate man-made hoaxes; others that they are formed by the Earth's magnetic field. And there are those who believe the circles are signs from extraterrestrials. The Stonehenge crop circle is one of several that have appeared in the English county of Wiltshire in recent weeks. More at Mail Online.