- 1 gigayear = 1,000,000,000,000 years.
- Frogs can't swallow with their eyes open.
- A whip makes a cracking sound because its tip moves faster than the speed of sound.
- The Olympic flag was designed in 1913.
- The $ sign was introduced in 1788.
advertisement
reload more facts | visit cool facts
add this widget to your website
|