Let's assume we've all been to a metal show before. Even with earplugs, because I'm a responsible grandpa, sometimes your ears ring for the next day or so. It's just the loud, loud nature of the beast. Fenplast, a company who produces soundproof glass, realized this and decided to test their product at a metal festival by having babies sleep behind the glass.
None of 'em woke up. I also encourage Fenplast to come to my apartment and install that same glass between me and my neighbor, who recently bought a subwoofer and is not clear on the distance low frequencies travel.
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