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Articles on Curious Kids

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A full set is two on the top and two on the bottom. Sebastian Kaulitzki/Science Photo Library via Getty Images

Why do people have wisdom teeth?

Two dental experts explain that these furthest-back molars may be a not-so-necessary leftover from early human evolution.
Two crystalline materials together: kyanite (blue) embedded in quartz (white). Photo 12/Universal Images Group via Getty Images

How do crystals form?

There are a lot of myths about crystals − for example, that they are magical rocks with healing powers. An earth scientist explains some of their amazing true science.
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?

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