- The symbols used for addition (+) and subtraction (-) have been around for thousands of years but it wasn't until the 16th century that most mathematical symbols were invented. Before this time math equations were written in words, making it very time consuming.
- The vocabulary of the average person is between 5,000 to 6,000 words.
- Greyhounds can reach speeds of up to 67kph (42mph).
- The rarest type of diamond is green.
- Rhinoceros have 3 toes on each foot.
- An area of the Suns surface to the equivalent of a postage stamp would shine with the brightness of over 1,500,000 candles.
- There are no rivers in Saudi Arabia.
- A soap bubble is 10,000 times thinner than the average human hair.
- Horses have 18 more bones than humans.
- Every year over 98% of atoms in your body are replaced.
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