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Why do they lick things?

I get that babies have an oral thing going on and use their mouths to test the waters, but toddlers and bigger kids should be over that by now, right? Then can someone please explain to me why my kids insist on licking the steering wheel of the car cart at the grocery store? Or the glass of the kids play area at Chick-fil-A? I will never understand this oddity.

Source: Flickr user Lars Plougmann