Wind chill is a fact of winter life for most Canadians.

Almost every winter forecast tells us that whatever the temperature is, it's going to feel colder because of the wind. But how exactly does that work?

Johanna Wagstaffe takes a look at the science behind wind chills, how the body reacts to winds and how the wind chill factor values are calculated, in this week's Science Smart video, in the player above.

If you have a science question you'd like answered, send Johanna a tweet (@Jwagstaffe) or an email: johanna.wagstaffe@cbc.ca.