- Most birds eat twice their body weight each day.
- More people are killed by hippopotamuses then by lions, elephants and water buffalos combined.
- The rarest type of diamond is green.
- Salt used to be a currency.
- Sound travels 4.3 times faster through water than in air.
- The corkscrew was invented in 1890.
- Hippopotamuses have skin 3.8cm (1.5in) thick.
- The word 'underground is the only word that begins and ends with the letters 'und'.
- Pandas spend 12 hours a day eating bamboo.
- Heliophobia is the fear of sunlight.
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