- The symbols used for addition (+) and subtraction (-) have been around for thousands of years but it wasn't until the 16th century that most mathematical symbols were invented. Before this time math equations were written in words, making it very time consuming..
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
- The term 'disc jockey' was first used in 1937.
- It takes 110 silkworm cocoons to make an average tie.
- The lie detector was invented in 1921.
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