LIVERMORE -- Two Lawrence Livermore Laboratory scientists will discuss how a safe material made with sugar and non-biological DNA can detect and track unhealthy aerosol releases at a talk at Las Positas College on April 3.

During the free event, scientists George Farquar and Elizabeth Wheeler will explain how FDA-approved food additives, combined with a unique DNA bar code, can produce a microparticle simulating airborne aerosols. The technology, the scientists say, could dramatically reduce costs in testing contaminants. The lecture takes place in the college's Multi-Disciplinary Building Lecture Hall, Room 2420, at 6 p.m.

Admission is free but there is a $2 parking fee.

Las Positas College is lat 3000 Campus Hill Dr., Livermore.

Contact Jeremy Thomas at 925-847-2184. Follow him at Twitter.com/jet_bang.