Question -- a lot of stories have used the idea that Clark can recognize Lois's heartbeat when he hears it, that he could pick her out of a crowd. I love that idea. But I'm wondering if that was ever said or implied on the show? I know he monitored Miranda's heartbeat to detect that she was lying, but I'm not sure the show ever took it any further than that, so I was wondering.

PJ

"You told me you weren't like other men," she said, shaking her head at him when the storm of laughter had passed.
He grinned at her - a goofy, Clark Kent kind of a grin. "I have a gift for understatement."
"You can say that again," she told him.
"I have a...."
"Oh, shut up."

--Stardust, Caroline K