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It’s no secret that volcanoes are dangerous. The recent eruption of Guatemala’s Volcán de Fuego has taken more than 110 lives. In Hawaii, lava has covered roads, destroyed cars and set fire to buildings. So it may come as a surprise to hear that people are wondering if they can use volcanoes to toast their…

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?