Eggs

Let's talk about eggs. One egg, cracked into a hot pan, tells you almost everything about how proteins work. The white turns from clear to solid white the moment heat hits it — that's protein unwinding and binding to itself, nothing mysterious, just structure changing shape. The yolk sets later and softer, because it's built differently, richer, slower to firm up. That's why you can have a runny yolk sitting on a fully set white, if you know your timing.

Choosing eggs is a matter of your senses, not the label. Shake one gently near your ear — a fresh egg makes no sound, an old one sloshes, because the air pocket inside has grown. Crack it into a bowl: a fresh yolk stands tall and round, the white clings close around it in two layers, not spreading thin and watery across the plate.

Some people say brown eggs are healthier than white ones. No — shell colour only reflects the hen's breed, nothing about what's inside. That belief leads people to overpay, or worse, to judge quality by the wrong thing entirely, while ignoring the sound test and the look of the yolk, which actually tell you the truth.