In this April 23, 2012, photo, Houston-area attorney Joe Gutheinz, right, looks through a microscope at rock particles that Rafael Navarro, left, a former Colombian toy manufacturer, contends are pieces of moon rock in Buffalo, Texas.  Navarro has placed the rock fragments on eBay and is offering them for sale 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)