- Flushable toilets were in use in ancient Rome.
- Dolphin's can detect underwater sounds from 24 km (15 miles) away.
- The human eye blinks over 4,200,000 times a year.
- 'Bookkeeper' and 'bookkeeping' are the only 2 words in the English language with three consecutive double letters.
- 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)..
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