- Employees of the Vatican pay no income tax.
- A cat has 32 muscles in each ear.
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
- 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..
- The opposite of a 'vacuum' is a 'plenum'.
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