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Articles on Curious Kids US

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The number zero was a relatively recent and crucial addition − it allows numbers to extend in both directions forever. pixel_dreams/iStock via Getty Images Plus

From thousands to millions to billions to trillions to quadrillions and beyond: Do numbers ever end?

Here’s a game: Tell a friend to give you any number and you’ll return one that’s bigger. Just add ‘1’ to whatever number they come up with and you’re sure to win.
The Punch Powertrain Solar Team car from Belgium competes in the 2017 World Solar Challenge near Kulgera, Australia. AP Photo/Geert Vanden Wijngaert

Why aren’t there solar-powered cars?

It’s common to see solar panels on rooftops and fields, but they aren’t widespread on cars − yet.
The queen, on the right with a larger, darker body, is bigger than the worker bees in the colony and lives several times longer. Jens Kalaene/picture alliance via Getty Images

Why do bees have queens? 2 biologists explain this insect’s social structure – and why some bees don’t have a queen at all

A queen’s main job in the hive is to lay eggs and pass genes on to offspring. But many bee species do just fine without queens or big colonies.
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.

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