- 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..
- Goldfish can see both infrared and ultraviolet light.
- The Arctic Ocean is the smallest in the world.
- The number 2 is the only number greater than zero that when added to or multiplied by itself gives you the same result (4).
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