Through thick and thin, we love a quick quiz! We think this is one of our hardest quizzes yet. Do you have the knowledge to thin out the clues and get full marks?

#1. Which of these is a chemical found in paper?

Paper is made from cellulose, a chemical that comes from wood, rags, plants and algae.

#2. Which of the following worms is not an animal?

Ringworm is a fungus that infects skin and often makes a ring shape.

#3. Which is the thinnest layer of Earth’s structure?

Earth’s crust is only 15–20 kilometres thick on average, which is only a tiny fraction of Earth’s 6371-kilometre radius.

#4. In which direction do racing sailboats go fastest?

When boats go straight downwind, their wind disappears as they go faster – but a side-on wind stays constant no matter the boat speed!

#5. How thick is the thinnest unsupported sheet of gold ever produced?

Scientists at the University of Leeds created sheets of gold that were only two atoms thick!

Was I right?


Congratulations! You are a real science whiz!

Oh dear! Better brush up before the next quiz!

If you’re after more fun science for kids, subscribe to Double Helix magazine!


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