For several months each summer, Monique Klinkenbergh gets up at dawn and heads to the tiny Wiltshire airport to climb into her ultralight aircraft. It's important for her to get in the sky as quickly as possible, as the sun rises over Southern England's rolling hills and lush green farmland, because hunting for crop circles is always a race against time. As soon as the first human feet touch the crops, carefully laid down in intricate geometric patterns and designs, all hope of a scientific investigation is lost. So Klinkenbergh and her colleague Andreas Muller start early. It's easy to dismiss crop circle truthers as conspiracy theorists, new-age spiritualists, or crazy people, but the fact is that there are crop circles. The intricate patterns in fields have been observed for centuries and, throughout that time, frequently proven to be man-made projects. Klinkenbergh and Muller aren't fooling themselves. They know assume crop circles are man-made. But, every so often, they find a