MichaelMosleyputshimselfthroughabatteryofhealthtestsavailabletopeoplewhofeelperfectlywell.Fromanexpensiveheartscantoanewnationalscreeningproceduretodetecttheearliestsignsofbowelcancer,Mosleysetsouttodiscoverwhichifanyofthetestsareworthdoingddd