1. The Glass-winged butterfly lacks coloured scales, which makes its wings transparent and helps it avoid predators.
2. Similar to Scotland, North Korea also has a mythical animal as its national emblem-the winged horse Chollima.
3. The sun and the moon appear to be the same in the sky because of an astonishing coincidence- the moon is 400 times smaller, but 400 times closer.
4. A solar-powered, 'self-filling' water bottle has been invented for bike riders. It condenses atmospheric moisture to automatically fill the bottle with safe drinking water.
5. There are about 60,000 miles of blood vessels in a child's body. If you took them all out, and laid them end to end, they would wrap around the world more than twice.
6. Nutella was invented, after World War 2, when an Italian pastry maker mixed hazelnuts with chocolate to extend his ration of cocoa.
7. Oxford University is older than the Aztec Empire.
8. A small cumulus cloud can weigh as much as two elephants and two scientists.
9. There are only few worlds in the English language which end in 'dous' like tremendous, horrendous, and the specialist zoological term apodous.
10. Rhinos like to cover themselves in mud to protect their skin from the sun and ward off parasites.
11. There are more than 150 breeds of dogs, divided into eight classes: non-sporting, working, herding, hound, terrier, sporting, miscellaneous and toy.
12. Tigers can eat up to 40 kilograms of meat at one time.
13. Octopuses communicate by changing their skin colour and give out high-pitched squawking noises.
14. A horse has 'monocular' vision, which means that different image is seen by each eye. The horse sees two different pictures at the same time.
15. Crocodiles are believed to have been around for over 200 million years.
16. Kiwi birds are blind, so they hunt by smell.
17. The chicken is the closest living relative to the Tyrannosaurus rex.
18. The statues in the Elephanta Caves were used for shooting practice by Portuguese soldiers.
19. It can take a month for a sloth to digest a single meal.
20. Handkerchiefs used to come in different shapes. King Louis XVI of France made a law that all handkerchiefs must be square shaped!
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