- A bumble bee flaps its wings at 160 times a second.
- 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..
- Achluophobiais the fear of the dark.
- 40% of Amsterdam commuters get to work by bicycle.
- The opposite of a 'vacuum' is a 'plenum'.
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