- The world's first paved streets were laid in Rome in 170 B.C..
- Frogs can't swallow with their eyes open.
- The longest recorded flight of a chicken was 13 seconds.
- The US flag has 13 stripes (representing the original 13 states).
- Greek mathematics developed from around the 7th century BC, producing many important theories thanks to great mathematicians such as Pythagoras, Euclid and Archimedes..
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