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Articles on Curious Kids US

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Astronomers can estimate ages for stars outside the Solar System, but not planets. Corbis Historical via Getty Images

How do astronomers know the age of the planets and stars?

Measuring the ages of planets and stars is tricky. An observational astrophysicist describes the subtle clues that provide good estimates for how old different space objects are.
Your bladder can signal the brain when it’s full, even while you’re asleep. Happyphoton/iStock via Getty Images

What happens if you need to pee while you’re asleep?

A pediatric urologist explains how the bladder and the brain communicate to wake you up when you need to ‘go’ – and how that communication might break down.
Some animals, including goats, regularly give birth to two babies at once. Image Source via Getty Images

Can animals give birth to twins?

Animals often give birth to litters of more than one offspring at a time. But are those babies twins?
Tears prevent your eyes from drying out and protect them from irritation and infection. Vizerskaya/E+ via Getty Images

Can you cry underwater?

An ophthalmologist explains how important tears are to keeping your eyes feeling good and working well – whether you’re on dry land or swimming in a body of water.
You don’t need to watch where you step when it comes to bacteria. Westend61/Getty Images

Do you crush microbes when you step on them?

You can squash small bugs by stepping on them, but can you crush even tinier microorganisms like viruses and bacteria? It turns out that you’d need to apply a lot of pressure.
Without spices, our meals would have less color and flavor. Helaine Weide/Moment via Getty Images

How do spices get their flavor?

Humans have figured out how to season their food with virtually every part of plants.

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