UFO sightings have been reported for centuries, but increased dramatically in the 1940s. In 1947, Kenneth Arnold had a sighting of strange flying objects that gained national attention and led to the term "flying saucer." In 1961, Betty and Barney Hill claimed they were abducted by aliens, and under hypnosis described examinations on board the craft. While some are skeptical of such stories being influenced by popular culture, others note governments have tried to cover up hundreds of UFO sightings. The vastness of the universe suggests other intelligent life could exist, so some believe UFOs may indeed be real.