According to Taylor, physics could potentially hold the answer, with crop-circle artists possibly using the Global Positioning System (GPS) as well as lasers and microwaves to create their patterns, dispensing with the rope, planks of wood and bar stools that have traditionally been used.
Microwaves, Taylor suggests, could be used to make crop stalks fall over and cool in a horizontal position – a technique that could explain the speed and efficiency of the artists and the incredible detail that some crop circles exhibit.
http://www.iop.org/news/11/aug/page_51614.html
