Why does the Sun shine?
The Sun is a star, and deep inside it something amazing happens all day and all night. Find out how the Sun makes its light and heat.
Ranki explainsAges 6+5 min
All questions
All 40 questions
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Space
Why does the Moon change shape?
Sometimes the Moon is a thin smile, sometimes a big round plate. Find out what is really going on, and learn the names of the Moon’s phases.
Tanki explainsAges 6+4 min
What are the planets in our solar system?
Eight planets travel around our Sun, from tiny, scorching Mercury to cold, windy Neptune. Meet them all and learn a trick to remember their order.
Ranki explainsAges 8+4 min
Why do stars twinkle?
Stars seem to sparkle and flicker at night. Find out how moving air makes starlight wobble, and why planets shine with a much steadier light.
Tanki explainsAges 6+4 min
How do astronauts live in space?
Floating breakfasts, sleeping bags on the wall and 16 sunrises a day. Discover how astronauts eat, sleep, wash and stay strong on the space station.
Ranki explainsAges 8+4 min
Animals
How do bees make honey?
Honey starts as a sweet juice inside flowers. Follow a busy worker bee from blossom to hive and find out how she turns nectar into honey.
Tanki explainsAges 6+4 min
Why do cats purr?
That soft, rumbly sound is one of the cosiest noises in the world. Find out how cats make it, and why they do not only purr when they are happy.
Ranki explainsAges 6+4 min
How do fish breathe under water?
You have to come up for air when you dive, but fish stay under water all day. Find out how gills pull the oxygen they need right out of the water.
Tanki explainsAges 6+4 min
Why do some birds fly away in winter?
Every autumn, millions of birds set off on amazing journeys. Find out why they leave, how they find their way, and which bird flies the furthest.
Ranki explainsAges 8+5 min
What is the biggest animal in the world?
It is longer than two buses and heavier than any dinosaur scientists know of. Meet the blue whale, the true giant of our planet.
Tanki explainsAges 6+4 min
Nature & Weather
Why is the sky blue?
Sunlight looks white, but it hides every colour of the rainbow. Find out why the air sends the blue part to your eyes, and why sunsets turn orange.
Ranki explainsAges 6+4 min
How is a rainbow made?
All you need is sunshine, raindrops and the Sun at your back. Find out how tiny drops of water split white light into a bow of bright colours.
Tanki explainsAges 6+4 min
Where does rain come from?
Rain is very old water on a trip that never ends. Follow a drop from a puddle up into the clouds and back down again, and see what the Sun has to do with it.
Ranki explainsAges 6+5 min
Why do volcanoes erupt?
Deep under your feet, some rock is so hot that it melts. Find out how gas and pressure push it up until a volcano erupts, and how scientists keep people safe.
Tanki explainsAges 8+5 min
How do plants make their own food?
Plants never go shopping or hunting, yet they grow all day long. Find out how leaves turn sunlight, water and air into food, and give us oxygen as a gift.
Ranki explainsAges 8+4 min
My Body
Why do we need sleep?
Every night you switch off for hours, but your body and brain stay busy. Find out what happens while you sleep, why we dream and how much sleep children need.
Tanki explainsAges 6+4 min
How does my heart work?
Your heart is a hard-working muscle about the size of your fist. Find out how it pumps blood around your body, what makes the lub dub sound and how to feel your pulse.
Ranki explainsAges 8+4 min
Why do we have bones?
Without bones you would flop like a jellyfish. Find out how your skeleton holds you up, keeps your brain and heart safe and works together with your muscles.
Tanki explainsAges 6+4 min
What happens to my food after I eat it?
Your lunch goes on a long, twisty journey through your body. Follow it from your mouth to your tummy and beyond, and see how your body takes out the good parts.
Ranki explainsAges 8+5 min
Why do we lose our baby teeth?
A wobbly tooth is a sign that you are growing up. Find out why baby teeth fall out, what pushes them and how to look after your new teeth.
Tanki explainsAges 6+4 min
How Things Work
How does the internet work?
Your messages and photos zoom around the world in tiny pieces. Find out how the internet carries them, and how to stay safe while you explore.
Ranki explainsAges 8+5 min
How do planes fly?
A big passenger plane is heavier than a herd of elephants, yet it floats through the sky. Find out how wings, engines and air work together.
Tanki explainsAges 8+5 min
What is a robot?
Robots build cars, clean floors and drive around on Mars. Find out what makes a machine a robot, and where the word robot comes from.
Ranki explainsAges 6+4 min
How does electricity get to my home?
Flick a switch and the light comes on. Follow electricity on its long journey from the power station, along the grid and into your home.
Tanki explainsAges 8+5 min
How do magnets work?
Magnets pull without touching, and sometimes they push. Find out which things stick, what poles are, and why the whole Earth acts like a magnet.
Ranki explainsAges 6+4 min
Long Ago
What happened to the dinosaurs?
Dinosaurs ruled the Earth for millions of years, then most of them vanished. Find out about the giant space rock, the dark sky and the dinosaurs still alive today.
Tanki explainsAges 6+5 min
How were the pyramids built?
Millions of heavy stones, no cranes and no lorries. Find out how the ancient Egyptians built the Great Pyramid, and who really did the hard work.
Ranki explainsAges 8+5 min
Who were the Vikings?
Fierce raiders with horned helmets? Not quite. Meet the real Vikings: farmers, traders and brilliant sailors who reached America long before Columbus.
Tanki explainsAges 8+5 min
What was life like in a castle?
Towers, moats and drawbridges sound exciting. But castles were also cold, smoky and a bit smelly. Step inside and meet the people who lived there.
Ranki explainsAges 6+5 min
Who invented writing?
The first writing was not a story or a poem. It was a list of sheep and grain. Find out where writing began and where our alphabet comes from.
Tanki explainsAges 8+5 min
Around the World
How many countries are there in the world?
Counting countries sounds easy, but it is a real puzzle. Find out why most lists say about 195, and which countries are the biggest and the tiniest.
Ranki explainsAges 8+5 min
Why do people speak different languages?
There are more than 7,000 languages on Earth. Find out how they grew apart, which ones are cousins, and how to say hello around the world.
Tanki explainsAges 6+4 min
Why is it day here and night somewhere else?
Right now, some children are eating breakfast while others are fast asleep. Discover how a spinning Earth gives us day, night and time zones.
Ranki explainsAges 8+4 min
What is school like around the world?
Uniforms or your own clothes, starting at 4 or at 7, lessons in a classroom or over the radio. Take a trip to schools around the world.
Tanki explainsAges 6+4 min
What are the seven continents?
Africa, Antarctica, Asia, Australia, Europe, North America and South America. Meet the seven giant pieces of land on our planet, and the oceans in between.
Ranki explainsAges 6+4 min
Feelings & Friends
Why do we feel angry?
Everybody feels angry sometimes, even grown-ups. Find out what anger does inside your body, and some calm, friendly ways to let it pass.
Tanki explainsAges 6+4 min
How can I be a good friend?
Listening, sharing, taking turns and saying sorry. Discover what makes a good friend, how to fix an argument and how to make new friends.
Ranki explainsAges 6+4 min
Why do we laugh?
Giggles, chuckles and belly laughs. Find out why we laugh, why laughing is catching, which animals laugh too and why you cannot tickle yourself.
Tanki explainsAges 6+4 min
Why do I get butterflies in my tummy?
A fluttery tummy before a test, a show or a first day is very normal. Find out what your body is doing, and some simple ways to feel braver.
Ranki explainsAges 6+4 min
Why is being kind so important?
A smile, a thank you or a helping hand can brighten someone’s whole day. Discover why kindness matters, how it spreads and small kind ideas to try.
Tanki explainsAges 6+4 min