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Articles sur Curious Kids

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Plastic trash accumulates in trees and shrubs along the Los Angeles River. Citizen of the Planet/Education Images/Universal Images Group via Getty Images

If plastic comes from oil and gas, which come originally from plants, why isn’t it biodegradable?

Plastic is made from oil and natural gas, which started out as fossilized plant and animal material. But buried deep underground for millions of years, those materials changed in important ways.
Interior view of Polito’s Royal Menagerie, Exeter Change, Strand, Westminster, London, 1812. Heritage Images/Hulton Archives via Getty Images

Where was the world’s first zoo?

Historians aren’t sure exactly when the first zoo was built, but it’s clear humans have kept exotic animals for thousands of years.
An artist’s concept of an astronaut walking on Mars. But what would happen if the astronaut weren’t wearing a space helmet? cokada/E+ via Getty Images

Could people breathe the air on Mars?

Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
The depths of the valleys on a key act like a code that must match the lock. Robin Smith/The Image Bank via Getty Images

How do keys open locks?

A computer security expert explains how keys work – and how they are like passwords.

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