- The smallest dog is the Chihuahua.
- Frogs don't usually swallow water (they absorb most of the moisture they need through their skin).
- The Arctic Ocean is the smallest in the world.
- Greek mathematics developed from around the 7th century BC, producing many important theories thanks to great mathematicians such as Pythagoras, Euclid and Archimedes..
- An octopus pupil is rectangular.
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