“People almost always try to exit through the same door they entered. In a crowded venue, ALWAYS take a second to find your exit, and then find a second exit. Mark them in your brain just in case. In an emergency, most of the crowd is going to go for the main door they came in through. Knowing where another exit is can save your life.”

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Source: https://www.buzzfeed.com/larryfitzmaurice/reddit-shares-little-known-facts-hacks