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Everybody loves a good mystery and sometimes the questions can be more interesting than the answers. Will Pearson investigates twenty unique mysteries with their broad spectrum of strangeness. Some, like the sudden disappearance of the sailing ship Mary Celeste's passengers and crew have gained universal currency. Was the Wow! Signal a radio transmission form deep space, or was it the ambient resonating frequency of a passing comet? Cryptids like Bigfoot and the Loch Ness Monster teeter on the boundaries of probable and improbable, hoax and reality, fact and fiction. Whether it be the intrigue of lost civilisations, like Göblekli Tepe in Turkey, sensationalist interest in The Zodiac Killer, or the elusive Shugborough Code that neither Dickens nor Darwin could crack, each unsolved mystery presents a challenge in its own way. Occasionally, it can feel as if there's a conspiracy at work - one in which scientists, journalists and 'professional explainers' want to put an end to anything and everything mysterious in life. Thankfully, not everything can be nailed down, sucked dry of its secrets and turned into a factoid. Mysteries do still exist - and continue to tease us. Sceptic or believer, the fun lies in probing them.