I have a friend who meticulously puts a small pinch of salt in her coffee before brewing. She says the salt slightly cuts down the acidity, and the flavor come

I have a friend who meticulously puts a small pinch of salt in her coffee before brewing. She says the salt slightly cuts down the acidity, and the flavor comes out a bit more. I'm not sure of the science behind it, but, she makes a damn good cup of coffee.