- 'underground' is the only word that begins and ends with the letters 'und'.
- A bolt of lightning can reach temperatures hotter than the sun.
- Camels are born without humps.
- The Earth experiences over 50,000 earthquakes a year.
- Italy and France produce over 40% of all wine.
- The human brain takes up 2% of human body weight but uses 20% of its energy.
- Cats can't move their jaw sideways.
- Commercial airplanes maintain a cabin pressure of about 6,400 feet (just over 1 mile) above sea level.
- Horses can't vomit.
- A blue whale's heart beats just twice a minute when it dives.
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