2. Supported by the National Endowment for Science, Technology and the Arts (NESTA) and Visions of Science Quite Interesting Science presents

3. Supported by the National Endowment for Science, Technology and the Arts (NESTA) and Visions of Science This week: Polar Bears

5. 1Canadians are meeting more polar bears, when they wander into towns. Why?

6. Polar Bears are in danger because of global warming. They need sea ice to hunt their food. But hotter summers in the Arctic are melting the winter ice too quickly. So hungry bears are wandering into towns.

7. 2What colour is a polar bear’s skin?

8. A polar bear's skin is actually black. It’s the fur that is white. Black skin allows it to soak up as much heat as possible from the sun. This is one of the bear’s many adaptations for ‘life in the freezer’.

9. 3How long before the Arctic ice melts completely: 10, 20, 50, 100 years?

10. According to the latest report, the ice could melt entirely during the summertime in 20 years. This would leave the Polar Bears with no habitat.

11. 4How could the melting ice affect the UK’s climate?

12. The UK’s climate is much hotter than it should be. It is on the same latitude as Alaska. The extra heat comes from a warm water current – ‘the Gulf Stream’. Some scientists believe that the meltwater (from the ice) could ‘switch off’ the Gulf Stream. This would create a ‘big chill’ in the UK.

13. 5What black and white animal do polar bears eat?

14. The black and white animal is a dead whale. The bears can smell them for 20 miles. It’s not penguins. They live in the Antarctic. Polar bears are in the Arctic. In fact, their favourite food is seals.

15. 6Global warming is caused by too much greenhouse gas. Which gas traps the most heat?

16. Carbon dioxide may be the most important, because of the quantities released. But the most powerful greenhouse gas is methane. It traps 21 times as much heat as CO 2.

17. 7How would you defend yourself from a Polar Bear attack?

18. Don’t run. Polar bears can run faster than human beings, particularly on ice. Either be aggressive, and shout to frighten it. Or pretend to be a dominant male. Stand on your backpack to make yourself bigger than the bear.

19. In partnership with the Novartis and The Daily Telegraph Visions of Science Photographic Awards. How did you do?

20. WHITE Click button for correct answer

21. PENGUINS Click button for correct answer

22. CARBON DIOXIDE Click button for correct answer

23. RUN Click button for correct answer