In this April 23, 2012, photo, Houston-area attorney Joe Gutheinz reviews documents in Buffalo, Texas, from a Colombian man, Rafael Navarro, who contends he has a moon rock and is offering pieces from it for sale on eBay for $300,000.  Gutheinz, a former investigator for NASA who practices law outside Houston, hunts for moon rocks, now-missing samples collected by the dozen American astronauts who walked on the lunar surface between 1969 and 1972. (AP Photo/Michael Graczyk)