The National Institute for Discovery Science has issued a report suggesting that fairly common "UFO sightings" of huge black triangles are in fact US military airships, lighter-than-air craft using electrokinetic drive. Some UFO groups claim that the black triangles are 600 feet long, 300 feet wide, and 40 feet thick. The NIDS report tracks over 200 "big black delta" sightings and notes that their flight paths appear to feature certain military bases. This would certainly explain the frequent sightings of silent black aircraft, but then, so would wishful thinking.--Stephen V Cole