How to Tell if Your Girlfriend Likes Someone Else. Even the most loving, trusting relationships are sometimes plagued by periods of doubt. If you've found yourself worrying that your girlfriend is harboring feelings for someone else, it's.
XKCD: Sky Color - Feynman recounted another good one upperclassmen would use on freshmen physics students: When you look at words in a mirror, how come they're reversed left to right but not top to bottom? What's special about the horizontal axis?