Emperor penguins have a few hidden tricks to stay warm, like blood vessels in the nose arranged so they can regain most of the heat that would be lost by breathing.
Without rules, you would have a LOT of decisions to make every day.
Flickr/Niklas Hellerstedt
Think of it like a ladder. You might not be at the top right now, but each new thing you learn takes you a step closer and means that your parents can relax the rules a little.
Jumping spiders, like this one, usually have eight eyes: two very large front eyes to get a clear, colour image and judge distance, and extra side eyes to detect when something is moving.
Flickr/Thomas Shahan
It’s true that here on Earth, if you want to burn something you need oxygen. But the Sun is different. It is not burning with the same kind of flame you would have on Earth if you burned a candle.
Being double jointed doesn’t mean you have an extra joint – an expert in biomechanics explains what makes some people doubly bendy.
Writing wasn’t just invented once by a single person. Many different ancient societies invented writing at different times and places.
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Writing has only been a part of the human story for the last 5,000 years. In comparison, humans began to communicate using speech some 50,000 years ago.
The short answer is that leeches need blood to grow and reproduce. But it’s in their interests to do it carefully, without causing too much pain, and in spots that are hard to find.
Around 66 million years ago, a huge rock from outer space (called an asteroid) smashed into the Earth.
Michael J/flickr
Dinosaurs ruled the Earth for about 180 million years. But around 66 million years ago, a huge rock from outer space (called an asteroid) smashed into the Earth. Then things got worse for dinosaurs.
Rocks contain a layer-by-layer record of the history of our planet.
Fred Moore/flickr
We know very little about the deep sea and how its inhabitants, including anglerfish, will respond to change. In fact, more people have walked on the Moon than have been to the bottom of the ocean.
A lot of chemical reactions happen in the very short time it takes to light a match.
Shutterstock
I have been interested in the science of fire and fireworks for a long time, and can tell you there is a lot happening in the very short time it takes to light a match.
Gravity helps stars to form.
UNIMAP / L. Piazzo, La Sapienza – Università di Roma; E. Schisano / G. Li Causi, IAPS/INAF, Italy
Gravity exists because the universe is full of ‘stuff’ – here’s how it came to be.
Everything in an animal’s body is made out of cells. And these cells need chemicals, such as salt, in and around them to work properly. The chemical balance needs to be just right.
Alyse & Remi/flickr
All the buildings and the cars and the restaurants, and the phones and even everything that’s inside of you… it all started with an exploding star, billions of years ago.
Baby teeth are only temporary. But they are important – so please look after them.
Philippe Put/flickr