- Elephants communicate in sound waves below the frequency that humans can hear.
- The average bed contains over 6 billion dust mites.
- Cats have over 100 vocal chords.
- Heliophobia is the fear of sunlight.
- Apples are more effective at waking you up in the morning than coffee.
- A rhinoceros horn is made of compacted hair.
- Heat, not sunlight, ripens tomatoes.
- While you sleep you can't smell anything, even really, really bad or potent smells.
- Greek mathematics developed from around the 7th century BC, producing many important theories thanks to great mathematicians such as Pythagoras, Euclid and Archimedes.
- It took Leonardo Da Vinci 10 years to paint Mona Lisa.
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