486. Introverts may be the best public speakers — they think through ideas more thoroughly than extroverts, who may make rash decisions instead.

487. Girls who mature early in life are more likely to be delinquent and emotionally aggressive later in life.

488. A study found that marrying an older man reduces a woman's lifespan, but marrying a younger man reduces it even more.

489. Your height is generally determined by your father. Intelligence, emotional strength and body shape is determined by the mother.

490. If there's something big you need to get done, tell your friends you're going to do it. The fear of looking like an idiot will motivate you.