I learned that Will 'O The Wisp is a weather phenomena that glows and can go inside and outside of structures. Ball Lightning is probably in the same catagory. "Foo Fighters" have been reported. I learned about "Foo Fighters" from the abcnews.com message forums, Science & Technology. I've seen on T.V. that pilots/Airforce personnel are afraid of coming froward with their accounts for fear of losing their jobs. The few that have come forward with a report, their reports are filed in the UFO category. Does physics explain these formations? Any thoughts? Thanks.