The decades-old mystery of D. B. Cooper, one of the most infamous unsolved crimes in U.S. history, may finally have a breakthrough. YouTuber Dan Gryder, known for his channel “Probable Cause,” claims to have uncovered critical evidence. He found the parachute rig he believes was used in the daring 1971 plane hijacking. Gryder, who has investigated the … Continue reading D. B. Cooper: YouTuber Solves 50-Year-Old Mystery