revealed known causes for most sighting reports,some UFO incidents will always remain unexplained. 6.Deja vu幻觉记忆 Deja vu is a French phrase meaning 'already seen,'referring to the distinct,puzzling, and mysterious feeling of having experienced a specific set of circumstances before. A woman might walk into a building,for example,in a foreign country she'd never visited,and sense that the setting is eerily and intimately familiar.Some attribute deja vu to psychic experiences or unbidden glimpses of previous lives.As with intuition, research into ,human psychology can offer more naturalistic explanations,but ultimately the cause and nature of the phenomenon itself remains a mystery 5.Ghosts鬼魏 From the Shakespeare play "MacBeth"to the NBC show "Medium,"spirits of the dead have long made an appearance in our culture and folklore.Many people have reported seeing apparitions of both shadowy strangers and departed loved ones. Though definitive proof for the existence of ghosts remains elusive,sincere eyewitnesses continue to report seeing,photographing,and even communicating with ghosts.Ghost investigators hope to one day prove that the dead can contact the living, provid ing a final answer to the mystery 4.Mysterious Disappearances神秘消失 People disappear for various reasons.Most are runaways,some succumb to accident, a few are abducted or killed,but most are eventually found.Not so with the truly mysterious disappearances.From the crew of the Marie Celeste to Jimmy Hoffa, Amelia Earhart,and Natalee Holloway,some people seem to have vanished without a trace.When missing persons are found,it is always through police work,confession, or accident never by 'psychic detectives').But when the evidence is lacking and leads are lost,even police and forensic science can't always solve the crime. 3.Intuition直觉 Whether we call it gut feelings,a "sixth sense",or something else,we have all experienced intuition at one time or another.Of course,gut feelings are often wrong (how many times during aircraft turbulence have you been sure your plane was going down?),but they do seem to be right much of the time.Psychologists note that people subconsciously pick up information about the world around us,lead ing us to seemingly sense or know information without knowing exactly how or why we know it.But cases of intuition are difficult to prove or study,and psychology may only be part of the answer. 2.Bigfoot大脚revealed known causes for most sighting reports, some UFO incidents will always remain unexplained. 6. Deja vu 幻觉记忆 Deja vu is a French phrase meaning 'already seen,' referring to the distinct, puzzling, and mysterious feeling of having experienced a specific set of circumstances before. A woman might walk into a building, for example, in a foreign country she'd never visited, and sense that the setting is eerily and intimately familiar. Some attribute deja vu to psychic experiences or unbidden glimpses of previous lives. As with intuition, research into ,human psychology can offer more naturalistic explanations, but ultimately the cause and nature of the phenomenon itself remains a mystery. 5. Ghosts 鬼魂 From the Shakespeare play "MacBeth" to the NBC show "Medium," spirits of the dead have long made an appearance in our culture and folklore. Many people have reported seeing apparitions of both shadowy strangers and departed loved ones. Though definitive proof for the existence of ghosts remains elusive, sincere eyewitnesses continue to report seeing, photographing, and even communicating with ghosts. Ghost investigators hope to one day prove that the dead can contact the living, providing a final answer to the mystery. 4. Mysterious Disappearances 神秘消失 People disappear for various reasons. Most are runaways, some succumb to accident, a few are abducted or killed, but most are eventually found. Not so with the truly mysterious disappearances. From the crew of the Marie Celeste to Jimmy Hoffa, Amelia Earhart, and Natalee Holloway, some people seem to have vanished without a trace. When missing persons are found, it is always through police work, confession, or accident never by 'psychic detectives'）. But when the evidence is lacking and leads are lost, even police and forensic science can't always solve the crime. 3. Intuition 直觉 Whether we call it gut feelings, a "sixth sense", or something else, we have all experienced intuition at one time or another. Of course, gut feelings are often wrong （how many times during aircraft turbulence have you been sure your plane was going down?）, but they do seem to be right much of the time. Psychologists note that people subconsciously pick up information about the world around us, leading us to seemingly sense or know information without knowing exactly how or why we know it. But cases of intuition are difficult to prove or study, and psychology may only be part of the answer. 2. Bigfoot 大脚