- The only continent with no active volcanoes is Australia.
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
- The most common mental illnesses are anxiety and depression.
- The fastest insect is the Australian dragon fly (its top speed is 57 km/h (35mp/h)).
- Elephants communicate in sound waves below the frequency that humans can hear.
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