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Articles on Curious Kids US

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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.
Brown poop can indicate good health. Vitalii Barida/iStock via Getty Images Plus

Why is my poop brown?

The answer is more complicated than you might think. It has to do with how your body gets rid of old red blood cells.
For almost as long as there have been computers, there have been video games. Neilson Barnard/Getty Images

Who invented video games?

Video games are everywhere. So who was the first person to come up with the idea of playing a game on a computer screen?
A dairy barn in Waitsfield, Vermont, built circa 1890. Thomas Visser

Why are barns painted red?

Barns are practical buildings, designed to safeguard farm animals and equipment. Why are so many of them painted to stand out from the landscape?
It only takes light about eight minutes to go from the Sun to Earth. loops7/E+ via Getty Images

Have we made an object that could travel 1% the speed of light?

The fastest things ever made by humans are spacecraft, and the fastest spacecraft reached 330,000 mph – only 0.05% the speed of light. But there are ways to go faster.
Three upright walkers, including Lucy (center) and two specimens of Australopithecus sediba, a human ancestor from South Africa dating back nearly 2 million years. Image compiled by Peter Schmid and courtesy of Lee R. Berger/Wikimedia Commons

When and how was walking invented?

Walking has taken a very long time to develop, with evidence of bipedalism among early humans in Africa roughly 4.4 million years ago.
On average, two students in every U.S. classroom have ADHD. damircudic/E+ via Getty Images

What causes ADHD and can it be cured?

Even when the condition lasts a lifetime, there are behavioral treatments and prescription drugs that make it easier for people with attention-deficit hyperactivity disorder to thrive.
Your teeth will be better off if you refrain from chomping on ice cubes. Credit: Laurence Monneret/The Image Bank via Getty Images

Is chewing on ice cubes bad for your teeth?

A dentist explains why this is a habit worth breaking – no matter the cause or the strength of your cravings to keep doing it.

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