It seems to me that it might be one of those genetic traits, like rolling your tongue. I'm a rightie but can only raise my left. Go figure.
Maybe you can learn how:
Chapter 2 - Action Unit 2 - Outer Brow Raiser
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We are always more anxious to be distinguished for a talent which we do not possess, than to be praised for the fifteen which we do possess.
Mark Twain
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