- A human brain weighs around 3 pounds.
- Alan Turing was a British mathematician and computer scientist who cracked German ciphers (codes) in the Second World War, contributed to mathematical logic and played an important role in the development of algorithms, artificial intelligence and the modern computer.
- A rat can tread water for 3 days.
- Babylonians measured the circumference of a circle as approximately 3 times the diameter, which is fairly close to today's measurement which uses the value of Pi (around 3.14).
- 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.
- American's eat 18 billion hot dogs a year.
- Dragonflies have 6 legs but can't walk.
- Over a third of all pineapples come from Hawaii.
- The Eiffel Tower is over 300m (984 ft) tall.
- Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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