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Our brains are pretty damn amazing. I mean, we have the ability to ‘fill in’ missing things when it comes to both vision and hearing. For example, this GIF has no sound, yet, a lot of people are able to ‘hear’ the THUD whenever one of the jumpers lands on the ground. While we don’t legitimately hear a noise, our brains ‘fill in’ that ‘noise’ by imagining the sound for us.