- 45% of people use mouthwash daily.
- Snakes can't bite in rivers or swamps (they would drown otherwise).
- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal..
- A shark's teeth are literally as hard as steel.
- The 'black box' that houses an airplanes voice recorder is actually orange so it can be more easily detected amid the debris of a plane crash.
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