- A soap bubble is 10,000 times thinner than the average human hair.
- Rio de Janeiro translates to river of January.
- The Hindu-Arabic numeral system began developing as early as the 1st century with a full system being established around the 9th century, forming the basis of the numerical digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 that we use today..
- Dirty snow melts quicker than clean snow.
- You can't tickle yourself.
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