When does summer end? The calendar tells us one thing, but astronomy tells us something else. See how meteorologists officially determine the end of summer.
What's perfect swimming weather? Check out what most people consider comfortable air temperatures and water temperatures for swimming -- then break out your goggles and snorkel!
Strong wind can make a cold day feel even colder by robbing heat from the human body. Here's the formula used by the National Weather Service and a link to the wind chill calculator.
The outer layer of our atmosphere (the exosphere) is a mysterious place between the atmosphere & outer space. See how high up it is & how scientists tell where outer space begins.
