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This is one of the most mysterious cases of world medicine. So far, this mystery has yet to be solved. Paul Kern  was a Hungarian physicist, fighting in the Eastern Front during World War I. In 1915, Paul was shot and  a bullet pierced the frontal lobe of the brain. The miraculous thing happened, that bullet was unable to steal the life of the young soldier. The unconscious Paul was unconscious at the hospital in Budapest. When Paul opened his eyes and woke up, he  never closed his eyes to sleep  until he died. After waking up, Paul could not sleep even though he visited many places, trying different methods from sleeping pills to hypnosis, but all failed. The doctors checked his skull and brain several times to find the cause, but they all "gave up."   >>The 20 flow<< Paul was fully awake and aware of the common sense even though he did not sleep for a minute in those years. Sometimes he has a headache caused by an old injury. D...

M urders are always disturbing, but some are even worse than that. These killings were brutal, almost unimaginable in their depravity. The crimes horrified communities and stumped police — leaving questions that lingered for decades afterward, as years passed without an arrest or even a credible suspect. As Netflix probes the cold case murder of a Baltimore nun in new docuseries The Keepers , TIME takes a look back at some of the most high-profile killings from the past 150 years. They vary in their details, but they all have one thing in common: a killer who has never been found. Here are six of the most vexing murder mysteries of all time: 1. Jack the Ripper terrorized London A scene from  Jack The Ripper , 1959. Paramount/Getty Images London’s most notorious serial killer prowled the East End over a century ago, preying on prostitutes and terrorizing the area. He made his mark as Jack the Ripper by killing and mutilating at least...