- Mathematical developments increased rapidly around the time of the Italian Renaissance in the 16th century and continued through the scientific revolution of the 17th and 18th centuries, becoming increasingly abstract in the 19th and 20th centuries..
- Mapping is older than writing.
- A piece of paper cannot be folded more than 7 times.
- Black on yellow are the 2 colors with the strongest impact.
- Elephants are the only mammal that can't jump.
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