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Make a curious device that doesn’t like being put near a candle flame. When it gets hot, it curls away!

What’s the coldest thing in the universe? You may have heard of absolute zero, the coldest temperature possible. But a clever bit of mathematics has shown it might not be possible after all!

Written by Matthew Dunn Illustrated by Alex Hallatt From absolute zero to the surface of the Sun, there’s a whole range of temperatures in our Universe. Let’s learn more!

Welcome to Double Helix magazine’s Q&A section – Microscope. We take a close look at small questions full of big ideas. Q: I want to know which is hotter, fire or lava? Or are they both the same?