1. Every year, hundreds of new trees grow because of squirrels forgetting where they buried their nuts.

2. There is a basketball court on the top floor of the U.S. Supreme Court Building. It's known as the "highest court in the land."

3. Even if they've never been able to witness it themselves, blind people smile when they are happy. Smiling is a basic human instinct.

4. Cows have best friends and they tend to spend most of their time together.