Make a friend close their eyes and listen to this video, then ask them what they're hearing. If you have wildly imaginative friends, they'll say they're listening to an all-out laser battle between enemies in an epic science-fiction blockbuster. If you have coldly logical friends, they'll say they can hear a rock bouncing on the thin frozen crust on top of a pond. Either way, be glad you have friends who'll let you make them watch videos with their eyes closed.
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