Most people brew coffee incorrectly in a French press, ruining its potential within the first minute. Over the years of working as a home barista and testing hundreds of cups, I've learned that it's not the machine that's to blame for the bitter taste, but a lack of understanding of simple laws of physics.

Many people make the mistake of choosing coffee for cold brew – they simply use whatever they have on hand in the cupboard, instead of consciously choosing the beans. This is a mistake, because the quality of your cold brew depends 70% on the raw material.

Have you ever wondered why some coffees taste better than others? Or why baristas in professional roasteries slurp coffee from their distinctive spoons with complete concentration and great volume?