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TIL there are lights which can track your location using your cell phone

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4XaxJ TIL there is a seemingly endless list of nicknames of poker hands. For example, a pair of nines is called a pair of Wayne Gretzkys.
lPer TIL that patients with traumatic injuries are less likely to die in hospital if they have alcohol in their blood, and the more alcohol, the more likely they are to survive. Burn injuries are the only exception.
R7N84 TIL Leonard Cohen originally wrote 80 draft verses for his song "Hallelujah." He chose several of the most relevant and interchanged some of them depending on where he was playing.
69y5X TIL that in the 1960s, San Diego considered building a floating stadium in Mission Bay for the Chargers and Padres, with modular pontoon sections to accommodate various events
RQa6 TIL that the Netherlands used to flood certain areas in times of war to create a military defensive line. The water was too shallow for boats, but deep enough to hide traps and ditches under.