- 20% of China's plants are used in medicine.
- 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..
- The US flag has 13 stripes (representing the original 13 states).
- Dogs sweat through the pads on their feet.
- India has the most post offices than any other country (over 100,000).
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