21 features of everyday items that you never knew actually served a purpose

You have used these everyday items at some point in your lives, but you've probably ignored their cool 'hidden features'. 

According to Acidcow, here are some of the most common things you never knew actually served a purpose.

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Did you know that the metal tab used to open cans is actually for you to put your straw through, so that it doesn't bob out of the fizzy drink?

These hidden features are about to make your life a whole lot easier. Check them out in the photo gallery.