A professor at Northeastern University has developed a unique firefighting robot that uses liquid nitrogen instead of chemical fire retardants to extinguish flames. The technology could one day help firefighters tackle dangerous wildfires more safely while reducing harm to the environment. The idea began almost by accident nearly 20 years ago. In 2008, Professor Yiannis […] The post New Robot Uses Liquid Nitrogen to Extinguish Wildfires Without Harmful Chemicals appeared first on Knowridge Science Report .