- In 1878 the first telephone book made contained only 50 names.
- There are over 10 trillion living cells in the human body.
- Mosquitoes prefer children to adults and blondes to brunettes.
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
- There are over 40,000 muscles tendons in an elephant's trunk.
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