Caffeine is the world’s most popular psychoactive substance; we cannot seem to get enough of it. Making great coffee depends on understanding the science: why water has to be at a certain temperature, what method works best with which grind, how roast affects taste, what happens when you add cream, which bean you start out with. How to Make Coffee lays out the scientific principles for the coffee-loving non-scientist - stick to these and you will never drink an ordinary joe again.