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Articles on Curious Kids US

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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.
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.
No matter its cause, diarrhea is uncomfortable. Rapeepong Puttakumwong/Moment via Getty Images

Why do people get diarrhea?

Poop comes in many shapes, sizes and textures. The kind that’s too runny might be the result of wayward germs, Crohn’s disease or lactose intolerance.
Step away from the cotton swabs! Crazytang/iStock via Getty Images Plus

What is earwax?

That brownish/yellowish gunk that comes out on your finger if you scratch deep inside your ear? It actually serves an important purpose in your body.
Specialized anatomy means flightless penguins are master swimmers. Christopher Michel

How many bones do penguins have?

How did penguins end up with so few bones – and become lightning-fast swimmers?
Allium schoenoprasum, better known as chives. Andreas Rockstein/Flickr

Why do plants grow straight?

Plants need light to feed themselves, so they grow in ways that help them collect as much of it as they can. Sometimes that’s straight up, but not always.
Most candy is basically just a heap of sugar. Atlantide Phototravel/Corbis Documentary via Getty Images

How much candy do Americans eat in a whole year?

A healthy diet can include some candy. But if you eat too much, it can interfere with your appetite for the stuff your body actually needs.
Lava flows from a fissure in the aftermath of eruptions from the Kilauea volcano on Hawaii’s Big Island, May 22, 2018. Andrew Richard Hara/Ena Media Hawaii via Getty Images

Why can’t we throw all our trash into a volcano and burn it up?

Volcanoes might seem like nature’s incinerators, but using them to burn up trash would be dangerous and disrespectful to indigenous people who view them as sacred.

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