Are actors smart?

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I don't mean bad judgment type things--we ALL know about that.

But it's something I've wondered about.

Kyra Sedwick was on At the Actors' Studio, and she said that her character Brenda was smarter than she was. She said she didn't believe that actors had to be smart to play someone smart. "I know some actors who aren't so smart who look really smart on screen."

I know actors have to have facility with language, and I always assumed that since so much intelligence comes through the eyes, that actors had to be pretty smart to pull off a smart character.