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Articles on Curious Kids

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An artist’s concept of an astronaut walking on Mars. But what would happen if the astronaut weren’t wearing a space helmet? cokada/E+ via Getty Images

Could people breathe the air on Mars?

Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
The depths of the valleys on a key act like a code that must match the lock. Robin Smith/The Image Bank via Getty Images

How do keys open locks?

A computer security expert explains how keys work – and how they are like passwords.
The same thing that makes their eyes glow helps cats see better in dim light. Cletus Waldman/EyeEm via Getty Images

Why do cats’ eyes glow in the dark?

A veterinary ophthalmologist explains what’s going on.
Pluto, the largest of the dwarf planets. This image was taken by NASA’s New Horizons spacecraft. NASA/JHUAPL/SwRI

What is a dwarf planet?

The dwarf planets in our Solar System are cold, dark, far away and full of surprises.
Children march in a parade marking the 70th anniversary of the end of the Second World War, in Rostov-on-Don, Russia, about 100 kilometres east of the Ukraine border, in May 2015. (AP Photo)

Curious Kids: Why did Putin invade Ukraine now? Is it for the U.S.S.R. again?

Russian President Vladimir Putin wants parts of Ukraine to be closer to Russia, and would like to prevent Ukraine from becoming part of NATO.
Memorial tanks at the Ukrainian Motherland Monument in Kyiv. Madeleine Kelly/SOPA Images/LightRocket via Getty Images

Why did Russia invade Ukraine?

Who are the Ukrainians and when were they part of the same empire as Russia? A scholar answers basic questions on war in Ukraine.

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