Index
Accounting for Calories
A hundred years ago only scientists and factory managers knew what a calorie was. What happened to turn the calorie into an essential element of dieting?
In Topic:
EnergyMiniature Power
The modern battery began life as a strange—and large—collection of silver, zinc, and brine-soaked cloth. Since the 19th century it has gone through many forms, but retained its size. How did one man and a war turn the bulky battery into the svelte version we know today and cannot live without?
In Topic:
Energy