1. Unsolved mysteries
... public in an effort to hide information about high-altitude spy planes. These planes, the Lockheed U-2A and the Lockheed SR-71, accounted for over half of the UFO reports during the late 1950s and 1960s. Some persons nevertheless believe that UFOs are extraterrestrial spacecraft, even though no scientifically valid evidence supports that belief. The possibility of extraterrestrial civilizations is ... , 1963, President and Mrs. John F. Kennedy made a campaign visit to Dallas, Texas. Enthusiastic crowds greeted them as their motorcade made its way toward downtown Dallas. Near the Texas Sc...
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