Flying high.
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It’s hard to believe, but big storms and hurricanes are caused by tiny particles moving around in the atmosphere.
The short answer is that leaves fall off trees when they aren’t doing their job any more.
Emily Nunell/The Conversation CC-NY-BD
Leaves fall off trees when they aren’t doing their job any more. If there isn’t enough water, the leaf can be damaged and stop working.
It’s true they do have an amazing ability to be able to sleep standing up. But they do also sleep lying down. If you’re a horse, you need to be able to do both.
Flickr/Loco Steve
Horses can stand on three legs and rest the other leg. They can change the leg they rest so that all of their legs get a chance to have a break.
Pounds and shelters are not happy places for dogs to stay in for a long time, though. So everyone tries to find an unwanted dog a new home as quickly as possible.
Flickr/Rob Swatski
Different councils and different rescue organisations can have different rules about how long they can keep animals.
A brain freeze is an intense ‘squeezing’ sensation on your head.
Nina Maile Gordon/The Conversation
There are several different science ideas around why, but the answer may have something to do with what happens when we cool down the roof of our mouth.
Web of flies.
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Spiders use different types of silk for different purposes – and not all of them are as strong as steel.
The experience that babies get from eavesdropping on their mother’s conversations in utero helps their brain tune into the language that they will learn to speak once they are born.
Emily Nunnell/The Conversation CC-BY-ND
Using a sing song voice helps babies tell the difference between words like ‘mummy’ or ‘daddy’.
Here’s a close-up picture of a head louse. The eggs of the female head louse are what we call ‘nits’.
We like to think that all creatures play a role in the local ecosystem. We’re especially interested in insects that provide a benefit for people too. But that’s not always how it is.
I spy with my little eye…
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Pets, like guinea pigs, lead very different lives to humans – and that’s why they need very different eyes, too.
Many other key arrangements have been tried. Some are claimed to be easier to learn or faster to use than QWERTY. But none has proved good enough to beat QWERTY.
Flickr/Jeff Eaton
The earliest typewriters had the letter keys in alphabetical order. The trouble was that if you hit two keys quickly the levers would jam.
The good type of tickles.
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Tickling is an important sign that someone – or something – is touching you. An expert explains how it works.
Very few people have ever had the patience to study how long garden snails live in the wild.
Emily Nunell/The Conversation CC-NY-BD
It has been reported that at least one snail lived as many as 14 years in captivity. His name was George and he lived in Hawaii, in the United States.
Yolks are a great source of vitamins, minerals, fats and proteins packaged up by the female animal for an embryo.
Emily Nunell/The Conversation CC-NY-BD
A yolk allows a developing animal to stay in an egg longer, boosting its chance of survival. The downside is the mother has to work hard finding extra food so her body can create a nutritious yolk.
What’s left after a star explodes.
NASA/ESA/JHU/R.Sankrit & W.Blair via Wikimedia Commons.
By studying old and dead stars, we can discover what will happen to our sun in the far, far future. And it won’t end with a big explosion.
The sea is blue because of the way water absorbs light, the way particles in the water scatter light, and also because some of the blue light from the sky is reflected.
Flickr/Fiona Paton
Photons stream from the sun and interact with all matter on Earth. Depending on what the light touches, some of the photons will get absorbed or soaked up. And some will bounce back.
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The first thing to know is that Siri is not a “who” – Siri is a “what”.
In the very beginning of the Roman calendar (more than 2000 years ago), there were only 10 months in the year.
Jule Berlin/Shutterstock
December is named for the Roman word for “tenth”. So, why is it the twelfth month?
Tigers have whisker hairs even on their front legs and chin!
thedigme/flickr
Whiskers are not just ordinary hairs. They are thicker and go deeper into the tiger’s skin and send messages to its brain about what is happening in the world around it.
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Meteorites might look like boring bits of rock – but each one has a fascinating story.
Nails help us scratch an itch, but also pick up tiny things.
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The short answer is we have evolved to have nails because they help us pick things up (like food) and pick things off (like bugs).