Cutting edge technology could reveal bombers

 作者:有舁基     |      日期:2019-03-03 05:20:01
By Debora MacKenzie LAST week’s devastating bomb attack in London, and the similar attack last year in Madrid, might have been thwarted had the two cities’ transport systems been fitted with a machine that for a while last year stood in a train station in New Carrollton, Pennsylvania. The machine, a scanner that looks similar to the metal detectors in airport checkpoints, detects molecules of explosive. But it takes 12 seconds to scan each person, and the trial was ended early before the busy Memorial Day weekend,