UCSF researchers have some hard questions for White House science advisor John Holdren. An interesting new round in the airport scanner wars: Why won't TSA make its scanners available for independent scientific assessment - the same kind of assessment required for medical imaging machines? That's the question asked of White House science advisor John Holdren by five researchers at UC San Francisco and one at Arizona State University in a letter titled "There is Still no Rigorous Hard Data for the Safety of X-Ray Airport Passenger Scanners." [link at url]...