- Brazil borders every country in South America except Chile and Ecuador.
- The compass and straight edge were powerful tools in the advancement of geometry, allowing the construction of various lengths, angles and geometric shapes..
- Brontophobia is the fear of thunderstorms.
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
- Dragonflies have 6 legs but can't walk.
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