- Dry ice transforms directly from being a solid to a gas.
- Crocodiles are colour blind.
- It is believed that Ancient Egyptians used complex mathematics such as algebra, arithmetic and geometry as far back as 3000 BC, such as equations to approximate the area of circles..
- A 15th anniversary is called a quindecennial.
- The 'you are here' arrow on maps is called an ideo locator.
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