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Articles on Curious Kids

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The Ringtail Unicornfish, which occurs in tropical marine waters of the Indo-Pacific. All fish sleep, even the weird-looking ones. Bernard Spragg/Flickr

Curious Kids: how do fish sleep?

Fish may not have eyelids to close, but they sleep – and perhaps even dream.
Stars come into existence because of a powerful force of nature called gravity. ESA/Hubble & NASA, Acknowledgement: Judy Schmidt

Curious Kids: how are stars made?

Stars begin their life inside very large, fluffy clouds of space dust and gas called nebulae.
Grant Elliott/Unsplash.

Curious Kids: why is the sea salty?

The salt in the sea has built up over billions of years – but it wouldn’t have got there without freshwater rivers and streams.
The remotely operated vehicle Deep Discoverer captures images of a newly discovered hydrothermal vent field in the western Pacific. NOAA

How deep is the ocean?

In some places, the ocean is almost 7 miles deep. Scientists exploring the ocean floor have found strange sea creatures, bizarre geologic formations and records of Earth’s history.

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