556. People who are angry with each other for the silly little things, are usually the ones who care about each other the most.

557. Yawning doesn't always necessarily mean you're tired, it also means your body needs more oxygen.

558. During sex, men tend to get distracted by worries about performance; women tend to be distracted by concerns about appearance.

559. American school buses are yellow because humans see yellow faster than any other color, which is important for avoiding accidents.

560. Lypophrenia - A vague feeling of sadness seemingly without cause. This often occurs when a person misses someone.