Under the surface of Mars lies an ancient, nuclear-powered city left by Martian citizens. At least, that’s what a group of space researchers think. And they’re trying to prove it by invoking a little-known remnant of President Clinton’s last days called the “Data Quality Act” that went into force in October of this year. The filing, dated October 31, 2002, gives NASA 40 days to address the complaint that there is faulty data on Arizona State University’s THEMIS Web site.