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。

　　从莎士比亚的剧作《麦克佩斯》到美国国家广播公司的电视节目《灵媒缉凶》，亡者的魂灵一直在我们的文化和传说中萦绕不去。许多人都声称自己曾目睹鬼魂现身，其中既有面目模糊的陌生人，也有业已故去的亲朋好友。鬼魂存在的可靠证据至今还是无从取得，虔信不疑的目击者们却依然在继续报告自己看到鬼魂、拍到鬼魂乃至与鬼魂交流的经历。致力调查鬼魂的人们希望有一天能证明死者可以和生者接触，由此为这个谜题找出最终的答案。

　　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。

　　人们会因为各种各样的理由消失不见，大多数是自行逃遁，有一些是碰上了事故，还有少数则是遭人绑架或杀害。但是，其中的大多数最终都会被人找到。真正神秘的消失就不是这样了。从“玛丽·塞莱斯特号”船员、吉米·霍法、艾米莉·亚艾尔哈特到娜塔莉·霍洛威，有些人似乎消失得无影无踪了。失踪人口被人找到不外乎警方破案、相关人员等自供以及偶然发现等几种原因，绝没有借助“通灵侦探”的情形。但是，在证据不足、线索中断的情况下，即便是警方和鉴证科学也并不总能解决罪案。

　　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。

　　说是“心底的感觉”也好，“第六感”也好，别的什么东西也好，我们或多或少都有过直觉的体验。当然，心底的感觉经常会错(有多少次，坐飞机颠簸的时候你觉得它肯定会掉下去呢？)，可也有很多时候似乎是正确的。心理学家们已经发现，人们会下意识地收集周遭世界的信息，由此便似乎能在不自知如何或为何的情况下感知或了解信息。但是，直觉的案例很难证明，也很难分析，而心理学家也可能只是答案的一部分而已。

　　2. Bigfoot 大脚

　　For decades, large, hairy, manlike beasts called Bigfoot have occasionally been reported by eyewitnesses across America. Despite the thousands of Bigfoot that must exist for a breeding population, not a single body has been found. Not one has been killed by a hunter, struck dead by a speeding car, or even died of natural causes. In the absence of hard evidence like teeth or bones, support comes down to eyewitness sightings and ambiguous photos and films. Since it is logically impossible to prove a universal negative, science will never be able to prove that creatures like Bigfoot and the Loch Ness monster do not exist, and it is possible that these mysterious beasts lurk far from prying eyes。

　　几十年当中，美国各地都不时有目击者声称自己看到了人称“大脚”的巨型多毛人形野兽。尽管目击者口中的“大脚”数以千计、足以构成一个繁殖种群，人们却连一具尸体也未曾找到。没有一个“大脚”被猎人杀死或是被超速的汽车撞死，连自然死亡的都没有。没有牙齿骨骼之类的实在证物，“大脚”存在的依据只是证人目击以及模糊不清的照片和录像。要证明一个全称否定判断从逻辑上说是不可能的，因此科学将永远不能证明“大脚”和尼斯湖怪兽之类的东西不存在。也有可能，这些神秘莫测的生物的确潜藏在人们好奇视线之外的远处。

　　1. The Taos Hum 陶斯之声

　　Some residents and visitors in the small city of Taos, New Mexico, have for years been annoyed and puzzled by a mysterious and faint low-frequency hum in the desert air. Oddly, only about 2 percent of Taos residents report hearing the sound. Some believe it is caused by unusual acoustics; others suspect mass hysteria or some secret, sinister purpose. Whether described as a whir, hum, or buzz and whether psychological, natural, or supernatural no one has yet been able to locate the sound's origin。

　　多年以来，美国新墨西哥州小城市陶斯的部分居民和访客一直被沙漠空气中一种微弱的低频噪声所困扰。奇怪的是，只有大约2%的陶斯居民说自己听见了这种声音。有些人认为它产生于特殊的声学作用，也有些人怀疑这是集体幻觉或是某种神秘邪恶行为的产物。不管人们形容这种声响还是呼呼声、嗡嗡声还是咝咝声，也不管它究竟是心理作用、自然产物还是超自然产物，至今还没人能找到它的来源。