- The US flag has 13 stripes (representing the original 13 states).
- Tree hugging is forbidden in china.
- Chinese mathematics developed around the 11th century BC and included important concepts related to negative numbers, decimals, algebra and geometry..
- 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..
- Light is electro magnetic radiation.
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