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#1. A triplane has 3 wings, but how are they arranged?
Triplanes, such as the Red Baron’s Fokker triplane, stack their wings vertically. This gives them lots of lift, but they can’t go very fast.
#2. Salt can kill some bacteria, but how does it work?
Salt can pull the water out of living cells, in a process called osmosis.
#3. True or false? Earth is spiralling closer to the Sun.
False. Earth is drifting further away from the Sun, like all the other planets in the solar system. The Sun is losing mass so cannot maintain the same gravitational pull.
#4. Some cultures see a smiling face when they look at the Moon. What are the dark patches you can see actually?
The dark plains on the surface of the Moon have the names of lakes and seas, but they are caused by asteroid impacts.
#5. What shape is our solar system?
Our solar system’s ‘bubble’, carved into space by solar wind, is actually a squashed crescent shape. It has also been compared to a deflated croissant.
#6. How long does it take for light to travel from the Sun’s surface to Earth?
We orbit the Sun at a distance of about 150 million kilometres. Light moves at 300,000 kilometres/second. Divide these and you get 500 seconds, or 8 minutes and 20 seconds.
#7. True or false? Some species of spider use long pieces of spider silk to fly.
True! Some spiders create sails from their silk, to help them fly on the breeze. This is called ‘ballooning’.
#8. By what common name are the ‘nares’ known?
Your nares are your nostrils.
#9. What kind of groups do hyenas typically form?
Hyenas live in structured groups, called clans, of up to 80 individuals led by one powerful alpha female.
#10. Which of the following octopus facts is false?
Octopuses have gills, not lungs. They can live for a few minutes out of water, but they don’t live in trees.
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