- 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..
- 90% people depend on alarm clocks to wake up.
- Spiders have transparent blood.
- Dogs sweat through the pads on their feet.
- Catoptrophobia is the fear of mirrors.
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