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It’s a simple word with a strange history. Andrii Oleksiienko/shutterstock.com

Curious Kids: Why do we say ‘OK’?

The word 'OK' has only been around for 180 years, but it's become the most spoken word on the planet.
Researchers pour a barrel of hagfish into a holding tank aboard a research vessel about 20 miles off the coast of Portsmouth, New Hampshire. AP/Steven Senne

Curious Kids: What in the world is a slime eel?

Hagfish have been called the most disgusting creatures in the ocean. But what are they?
A male Olive-backed Euphonia (Euphonia gouldi), photographed in Costa Rica. Andy Morffew

Curious Kids: Why do birds sing?

Birds spend a lot of time and energy singing, but they don't do it the same way in every season of the year. And some can't sing at all. What's the purpose of birdsong?

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

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