People during the 1970's where my Dad worked made UFO's!!! My Dad worked for major auto company at the time and his employer was working furiously to comply with EPA emission standards. The company had engineers and techs working 24/7 although the late night shift was very slow. One of the things that automotive emissions labs use is lots of bottled gasses, and one they were using at the time was Hydrogen. The techs would fill garbage bags with Hydrogen, tie a string with a smoldering cigarette to the end (the strings had an accelerant on them as well) and let them go outside. The bags would float skyward, when the cigarette burned to the string, the whole bag would burst into flames and disappear. Eventually management caught on to what was happening and the unofficial project was brought to a halt. There were many reports of UFO's in the area, some were caught on radar...