- 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..
- Acorns are poisonous to humans (if eaten it can cause damage to your kidneys).
- Natural gas has no smell (the odor is artificially added so that people are able to identify leaks).
- The average age of a polar bear in the wild is 17 years.
- The frozen foods were first introduced in the 1920..
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