It can feel jarring to restart your computer and see an error message instead of your computer’s lovely login screen. Worse, when that error message is one of these scary ones...

The same running workout feels harder on a hot day than on a cool one, and it's not just your imagination. We really do slow down in the heat -- at least until we've adapted to it -- and it's possible to calculate exactly how much.

Video: Like most ways of measuring things, the United States uses a different temperature scale than most of the rest of the world. However, the Fahrenheit scale often doesn't make much sense compared to the Celsius scale. This video explains why.