A simple infrared-sensing camera and some fancy software can reveal the presence of a concealed knife or gun.

PITTSBURGH, Pa. — Shootings in U.S. schools have grabbed attention throughout the past few years. And they seem to be happening more and more frequently. On average, there has been one shooting that has killed or injured someone at a school each week this year. A key to limiting such events, some people argue, is keeping concealed guns out of schools. A student from Maryland has now developed a system to reveal hidden firearms. It should even work with other weapons.

Source: Heating up the search for hidden weapons | Science News for Students