Articles sur Curious Kids

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Cars are often warm and comfortable and we are usually feeling safe and relaxed. Marcella Cheng/The Conversation NY-BD-CC

Curious Kids: Why do we always fall asleep in cars?

You might be trying to catch up on sleep. Sleep scientists say some children need only nine hours of sleep at night, while others need as much as 11 hours. It depends on the person.
The leaves of most plants are green because the leaves are full of green chemicals. Marcella Cheng/The Conversation

Curious Kids: Why are leaves green?

This is an article from Curious Kids, a series for children. The Conversation is asking kids to send in questions they’d like an expert to answer. All questions are welcome – serious, weird or wacky! Why…
X-rays are like light rays, but they can pass through more stuff. Marcella Cheng/The Conversation

Curious Kids: How do x-rays see inside you?

X-rays are like light rays, but they can pass through more stuff. Some of the x-ray's energy is blocked by bone, which is why you can see bones so clearly on x-ray scans.
Worms do have something in their mouth that they can poke out, like a tongue. It is called a stylet. Flickr/DJ SINGH

Curious Kids: Do worms have tongues?

The short answer is no. But worms can use different parts of their body to do some of the jobs that our tongues do - like tasting and crushing food.
Here’s a modern human skull on the left, and Neanderthal skull on the right. Darren Curnoe

Curious Kids: Where did the first person come from?

Maeve, age 8, has a question that has stumped many scientists over the years. And that’s because it’s a surprisingly tricky question to answer. It depends a bit on what you mean by 'person'.
Without satellites, modern technologies such mobiles phones and GPS would not exist. Flickr/NASA Goddard Space Flight Center

Curious Kids: How do satellites get back to Earth?

We've all seen videos of satellites being blasted off into space - but once they're locked in orbit around the earth, how do we bring them back down?
The mass of the Earth is big enough that the gravitational force it creates can pull the hard shape of ice, rock and metal into a sphere. NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center

Curious Kids: Why is the Earth round?

Imagine the Earth pulling everything it is made up of, all of its mass, towards its centre. This happens evenly all over the Earth, causing it to take on a round shape.
Bees usually get nectar from flowers, but sometimes they steal it from the nests of other bees. Flickr/Michael Cheng

Curious Kids: Do bees ever accidentally sting other bees?

Bees sting other animals, including humans, when they think there might be a threat to their hive. But Evie, age 8, wonders if bees ever accidentally sting other bees.

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