- The revolving door was invented in 1888.
- The elevator was invented in 1850.
- A rainbow can only be seen in the morning or late afternoon.
- Small dogs usually live longer than larger breeds.
- The most difficult-to-pronounce town is in Wales: Llanfairpwllgwyngyllgogerychwyrndrobwyll llantysiliogogogoch.
- Australia has the largest sheep population.
- Jellyfish can clone themselves.
- Ostriches have a powerful immune system.
- Humans can encourage precipitation with cloud seeding.
- That in the 17th century the value of pi was known to 35 decimal places (today to 1.2411 trillion).
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