Well this is creepy. Apparently, a new technology can detect changes in light caused by a decomposing body (shudder), and scientists are using it to discover unmarked graves. Special cameras measure the changes in light (including ultraviolet and infrared) coming from soil and plants, and are able to determine where decomposing bodies have been buried. Researchers expect the technology to help solve missing person cases and to reveal mass grave sites from hundreds — even thousands — of years ago.
The project was started when a zoo in Canada wanted to exhume the body of an elephant to display its skeleton, but didn't know where it was buried. They used cameras in a helicopter over the area, and found not only the deceased elephant, but 25 other graves, some as deep as eight feet. I'm sure this technology will have practical applications (like helping to solve crimes), but honestly, it totally creeps me out!