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Because the actual cutting edge is the thinnest part of the blade it reacts more to the heat, the closer to the cutting point you get. This has the effect of stretching the point out making it a...

That's why I'm here Citizen Shaver. X Man to the rescue! :D

The hot edge is, theoretically at least, sharper than the cool one by virtue of expansion of the metal. That's better for your face. Anyone putting the blade before their face has their priorities...