- 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..
- The world's knowledge is growing so fast that 90% of what we will know in 50 years time will be discovered in those 50 years.
- Chinese mathematics developed around the 11th century BC and included important concepts related to negative numbers, decimals, algebra and geometry..
- Goldfish can see both infrared and ultraviolet light.
- The cheetah is the only cat that can't retract it's claws.
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