At one end of the tube is a source of ultraviolet light and at the other a detector.

BBC: Hidden graves found using chemical 'sniffer' technology

Other ideas include building a detector to see if the spin of an atomic nucleus can be measured, or using the technique as an ultrasensitive antenna.

ECONOMIST: Scientists measure a few yoctonewtons for the first time

"The archaic system of an X-ray machine and metal detector cannot pick up other potential threats posed by passengers, " Baum says.

CNN: Behavioral screening -- the future of airport security?

Other features include the "Forgotten Attachment Detector, " which prevents users from sending messages without the necessary attached documents, and "Pictures In Chat, " which shows pictures of your friends as you chat with them in Gmail.

FORBES: Magazine Article

Lie detector tests have been suggested to back up other ways of ensuring people are where they are supposed to be.

BBC: Who is on the sex offenders register?

At Hamilton Sheriff Court and the town's railway station more than 340 were scanned using a mobile metal detector in a bid to reduce the amount of knives and other weapons on the streets.

BBC: Police raids target violent crime

With The Leap motion detector (which Newcomb was one of the first to test) and other high resolution input methods on the horizon, the performance demands on apps will only increase.

FORBES: Famo.us Cracks The Secret Of High-Performance Apps By Tapping Another Dimension