In today's batch:
"The historical records include the transcript of a 1949 conference in Los Alamos, New Mexico, of top physicists and scientists, including those who worked on the Manhattan Project. The conference attendees tried and failed to explain "green fireballs" that had been spotted over the nuclear lab. One theory held that they were meteors entering the atmosphere, but a prominent astronomer noted that "nothing like this … has ever been observed in the case of meteorite drops."