The U.S. military has a new weapon:  An "active denial system" that "shoots a beam that makes people feel as if they are about to catch fire."  That makes me smile.  This "ray gun" uses a form of microwave radiation called electromagnetic millimeter waves that are capable of penetrating a very thin layer of human skin.  The penetration heats the skin up to about 130°F, making it extremely uncomfortable but completely non-lethal and non-injurious.  God bless America.  (via Mental Floss) #science