511. Scientists have found that babies sometimes cry at night to prevent their parents from making another baby.

512. Research finds that the more a person understands their own value, the less likely they are to be discouraged by critics.

513. The first to apologize is always the bravest. The first to forgive is the strongest. The first to forget is the happiest.

514. According to a study, wishing someone luck makes them feel and do better.

515. Confidence is the key. If you don't believe in yourself, then nobody will.