The possible varieties of angel hair increase with the development of new technologies. During March and April 1959, the Air Force received many reports that flying saucers were cruising over the mountains near Coburn, Virginia, regularly used a landing strip on an inaccessible peak of Sheep Rock Mountain, and frequently dropped angel hair on the nearby countryside. The investigating officer collected some of the material and identified it as a type of “window,” the rolls or long strips of aluminum foil used by the military in World War II to produce spurious radar echoes and confuse enemy anti-aircraft fire. The Coburn angel hair was identical with the foil used by Air Force planes carrying out experiments in the area. “Window” falls very slowly; dropped from a height of 40,000 feet, it may easily be visible for some time to ground observers, as well as interfere with local radar reception[XI-10]. A similar angel-hair incident was reported on November 23, 1960, when many residents in southern Michigan and the Midwest reported a mysterious, glowing white object in the eastern sky that was dropping strange material to the earth. Witnesses described the object variously as a comet, a satellite with a tail, or a saucer-shaped UFO. The angel hair was quickly identified as foil dropped by planes that were conducting a test of radar reception[XI-11]. Reports of angel hair still come in occasionally to ATIC and, if the explanation is not immediately obvious, are investigated. On the afternoon of October 12, 1959, officials at Robins Air Force Base, Georgia, received a telephone call stating that unidentified substances were falling from unknown objects in the sky near the town of Washington. Two Air Force investigators arrived in the town before evening to interview the witnesses and examine the material. The first sighting had occurred shortly before noon, when a farm woman noticed an object in the sky, traveling not particularly fast from southeast to west. A stream of peculiar-looking substance, broad as the vapor trail of a jet plane, was trailing behind and floating toward the earth. The object itself was “as large as a football,” brown or black in color, and maintained a perfectly straight, even course. A few hours later in a town a few miles northeast, a man mowing his lawn noticed on the grass two whitish-gray streaks about ten feet long and eight inches wide, extending from east to west. Deciding that the peculiar streaks were a fungus or a mold, he mowed across them; at once a gray dust rose about twenty inches into the air and then settled back to earth.