- A deck of cards should be shuffled at least 7 times before playing.
- 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..
- There are no rivers in Saudi Arabia.
- Sharks can sense a drop of blood from 4km (2.5miles) away.
- Ferrets sleep between 18 - 20 hours a day.
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