BBC News: Scientists in Italy think they may have come up with a new way to scan for cancer of the stomach or colon.
The "spider pill," which is fitted with a camera, is swallowed by the patient and once within the colon or intestine the legs are opened and the device crawls along the intestinal tract, taking pictures as it goes.
The usage of cameras to scan for cancer already exists for a while. http://hannahchan.com/blog/2010/11/19/discover-cancer-with-a-pill-camera/ However a moving camera, like a spider feels kinda creepy to me. Might have been better to describe it in a different way.