After Four Years of Living a Nightmare, This Missing Boy Outsmarts His Evil Stepmother

The More You Know

• There are snakes with two heads, which compete with each other for food.
• The hashtag symbol is technically called an octothorpe.
• A reservoir in space holds 140 trillion times the amount of water in Earth's oceans.
• There's a shrimp-like creature that makes aluminum armor to protect itself.