Why does salt change taste of everything?

If your coffee is too bitter, add a pinch of salt. If your salad isn't sour enough, add a pinch of salt. If your beer is too bitter, add a pinch of salt. Salt has the seemingly magical ability to enhance good flavors and dampen bad ones. How does it do that??? https://youtu.be/dWatMuHZIxE

Youtube ID: dWatMuHZIxE

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