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- Either grain or copper or silver was used as currency by the Ancient Egyptians.
- Propeller aircraft have come from the humble Wright Flyer and have a top speed of around 48 kph (30 mph).
- The second-largest shark in the world is the basking shark and it is also the second-largest fish ever.
- Leonidas of Sparta remains one of the greatest warriors in history.
- Cowhide leather is one of the most common types of leather and it comes from the skin of cows.
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