1) The most-watched television event in the United States is the Super Bowl, with millions of viewers tuning in each year.

2) The ozone layer, located in the Earth's stratosphere, protects us from harmful ultraviolet (UV) radiation.

3) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).

4) The Olympic motto is "Citius, Altius, Fortius," which is Latin for "Faster, Higher, Stronger."