- Trees do not have life expectancies (most can grown indefinitely).
- The lifespan of a squirrel is 9 years.
- There is no sound in space.
- Babylonians measured the circumference of a circle as approximately 3 times the diameter, which is fairly close to today's measurement which uses the value of Pi (around 3.14)..
- Household dust is made of dead skin cells.
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