The MacBook Air has many uses, however using it to cut a birthday cake? Never thought of that one! A CTO over at HP received a nasty birthday present in the form of an Air, so what does he do? Tests just how razor-sharp the laptop is, on his chocolate cake. "It's so damn sharp, it did a fine job", the birthday boy Rahul Sood claimed. There you have it - a glowing recommendation for the MacBook Air, from an HP employee...