She's thinking about him, their date reputation, and tomorrow at school with him. He's brushing his teeth. Adding machine vs. Computer An adding machine adds up, when done you can have the tape go back and show exactly where you got your answer, double check, etc. Computer just pops out the answer, you have no idea how it came up with it, you're even skeptical, but it's most likely right. Men think it through point by point like an adding machine and seem to need more time to do it.
Women seem to assess the situation instantly.
It's actually more easily linked to their universal ability to take so much in that they don't often realize they've noted something and included it in their assessment. Physical vs. Emotional Boys like what they can touch, measure, color. Girls like what they feel good about. Think about children playing outside. Boys - GI Joe, trucks, bombs, grunts, wrestling, etc.