- A man once ate an entire airplaneu2014it took him 2 years.
- Gentoo penguins propose to their life mates with a pebble.
- The Eiffel Tower is repainted every 7 years.
- Earth is the only known planet where fire occurs.
- Dogs can make about 10 sounds, while cats make about 100.
- The equals sign (=) was invented in 1557 by a Welsh mathematician named Robert Recorde.
- The first hot air balloon passengers were a sheep, duck, and rooster.
- 99% of our solar system's mass is the sun.
- Adult humans are the only mammal that can't breathe and swallow at the same time.
- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal.
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