- 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..
- Paper money was first used in China.
- The TV sitcom Seinfeld was originally called 'The Seinfeld Chronicles'.
- A piece of paper cannot be folded more than 7 times.
- Dry ice transforms directly from being a solid to a gas.
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