Cold atmospheric plasma jet (IMAGE) DOE/Princeton Plasma Physics Laboratory Caption This cold atmospheric plasma made with helium gas was used to gather real-world data for developing artificially intelligent software that provides the chemical composition of the jet’s output. The purple glow is caused by collisions that excite the gas atoms in the plasma, causing them to release light as energy. Credit Credit: Li Lin, The George Washington University Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.