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In this Tuesday, Jan. 26, 2016 photo University of Rhode Island engineering professor Otto Gregory is reflected in a silicon wafer, that contains sensors to detect explosives, in front of a thin film surface analyzer, behind, in a laboratory on the school's campus, in North Kingstown, R.I. He has developed a sensor that detects the explosive used in the Paris bombings, to try to stop future attacks. Gregory compares his sensor to a dog’s nose, the gold standard in explosives detection. It “sniffs” the air for vapors emitted from explosives. (AP Photo/Steven Senne)

In this Tuesday, Jan. 26, 2016 photo University of Rhode Island engineering professor Otto Gregory is reflected in a silicon wafer, that contains sensors to detect explosives, in front of a thin film surface analyzer, behind, in a laboratory on the school's campus, in North Kingstown, R.I. He has developed a sensor that detects the explosive used in the Paris bombings, to try to stop future attacks. Gregory compares his sensor to a dog’s nose, the gold standard in explosives detection. It “sniffs” the air for vapors emitted from explosives. (AP Photo/Steven Senne)

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