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Articles on Curious Kids US

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Leap Day is coming. Marvin Samuel Tolentino Pineda/iStock, via Getty images

Why does a leap year have 366 days?

Humans have synced their calendars to the sun and moon for centuries, but every so often, these systems need a little correction.
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.

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https://theconversation.com/us/topics/curious-kids-us-74795

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