- 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 around 30 milligrams of caffeine in the average chocolate bar while a cup of coffee has around 100 to 150.
- Sound travels 10 times faster through granite than air.
- Blue flames are the hottest, reaching temps up to 3,000 degrees Celsius.
- 20% of all the oxygen you breathe is used by your brain.
- The average person laughs 10 times a day.
- The numerical digits we use today such as 1, 2 and 3 are based on the Hindu-Arabic numeral system developed over 1000 years ago.
- Earth is the only known planet where fire occurs.
- Hippopotamuses are born under water.
- A Galapagos tortoise can take up to three weeks to digest a meal.
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