food
- How Carbonation Works: Why Soda Fizzes and Goes Flat
Carbonation dissolves carbon dioxide gas into water under pressure. When the bottle is opened, the pressure falls and the gas escapes as bubbles, which is the fizz. - Cheese Making: The Controlled Spoilage of Milk
How milk becomes cheese: acid and enzymes curdle it, microbes ripen it, and the entire diversity of cheese follows from four controllable variables.