Nature
22 explanations and counting.
What is a glacier?
A glacier is a river of ice that moves so slowly you can't see it — but given enough time, it carves valleys, shapes mountain ranges, and stores a significant chunk of Earth's fresh water.
How do animals communicate?
Whales sing songs that carry thousands of miles. Bees dance directions to food sources. Elephants talk in sounds too low for us to hear. Animals have complex languages — just not ones we fully understand yet.
What is permafrost?
Beneath the soil in the Arctic, the ground has been frozen solid for thousands of years. As the planet warms, it's thawing — and releasing a gas that could dramatically accelerate climate change.
How do wildfires spread?
A wildfire can move faster than a person can run and leap between trees like a living thing. Understanding exactly how they spread helps explain why they've become so much more destructive.
What is coral bleaching?
Coral reefs are some of the most biodiverse places on Earth — and they're dying. When seawater gets too warm, corals expel the algae that give them colour and food, turning ghostly white. Here's what's happening.
What are microplastics?
Plastic doesn't disappear when you throw it away — it just breaks into smaller and smaller pieces. Those tiny fragments are now in our oceans, our food, our air, and our blood.
What is plastic doing to the ocean?
Over 8 million tonnes of plastic enter the ocean every year. Here's where it goes, what it does, and why it's so hard to clean up.
How do trees communicate?
Trees can warn each other about insect attacks, share nutrients with their neighbours, and support their young. They do it without brains, nerves, or a single word.
How do rainbows form?
A rainbow is sunlight and rain working together to split white light into every colour at once. Here's the precise physics of how it happens.
What is camouflage?
From flounder fish that match the seabed pixel-for-pixel to stick insects that look exactly like sticks — the arms race between predator and prey has produced astonishing disguises.
What is the ozone layer?
A thin layer of gas 15–35km up shields all life on Earth from radiation that would make it uninhabitable. We nearly destroyed it — and then we didn't. Here's the whole story.
What is the food chain?
Everything eats something, and something eats everything. The food chain maps these relationships — and when any link breaks, the whole chain shudders.
How do fish breathe underwater?
Fish need oxygen just like you do — but they extract it from water instead of air. The system they use is remarkably efficient.
Why do animals go extinct?
99% of all species that have ever existed are extinct. Extinction is normal — but what's happening now is not normal at all.
How do spiders make webs?
Spider silk is stronger than steel by weight and more elastic than rubber. The engineering behind a spider web is genuinely extraordinary.
What causes climate change?
The planet has warmed by about 1.2°C since the Industrial Revolution. Here's what's causing it and why even small temperature changes matter enormously.
Why do animals migrate?
Every year, billions of animals travel thousands of kilometres with no maps, no GPS, and no guarantee of survival. Here's why they do it — and how.
How do bees make honey?
Honey is flower nectar, transformed by tens of thousands of bees working in a precisely coordinated process. Here's the full story.
Why do leaves change colour in autumn?
Every autumn, millions of trees put on one of nature's great colour shows. It's not random — it's the tree doing some very clever chemistry.
How do plants make food?
Plants do something remarkable: they pull food out of thin air using sunlight. It's called photosynthesis, and without it, almost nothing on Earth could survive.
What causes earthquakes?
The ground beneath your feet is in slow, constant motion. When two sections suddenly slip past each other, the result can be devastating.
How do volcanoes work?
Deep beneath your feet, the rock is so hot it's liquid. Sometimes, it finds a way out.