weather • The Science 360

Environment 01

Count from flash to thunder and divide by 3 for km or 5 for miles. Why it works, how temperature changes it, and why any thunder means go indoors.

Environment 02

The water on a cold glass comes from the air, not the drink. It forms when the glass is colder than the dew point. Here is how to work that out.

Environment 03

Sweat only cools you when it evaporates, and humid air slows that down. The heat index puts a number on it: 32 °C at 70% humidity feels like 40 °C.