651. Erotomania is a rare disorder in which someone believes that someone from a higher social status is in love with them.

652. The most lethal psychiatric disorder is anorexia; between 5%–20% of sufferers die from it.

653. Some psychologists view shyness as an evolutionary advantage. While braver animals may have more food and more mates, shy animals avoid attacks and live longer.

654. Exceptionally attractive women are at a disadvantage when seeking a job associated with particularly masculine qualities. For example, if a more attractive woman and a less attractive woman compete for a job as a tow truck driver or operating a switchboard, the more attractive woman rarely wins the job. Researchers suggest that a highly attractive woman is perceived as less capable of meeting the job’s requirement for masculine qualities than an unattractive woman.

655. Studies show that women laugh at men they’re attracted to, and men are attracted to women who laugh at them. From a man’s perspective, saying a woman has good sense of humor doesn’t mean she makes jokes; it means she laughs at his jokes.