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Series 2: 10. Lifeboat and Concrete
She goes on a training rescue mission with a lifeboat team to find out how the equipment on a lifeboat works. She shows us how the special thermal-imaging cameras are used to find people who are in trouble - even at night! Next, she visits a quarry to see how gravel, sand, cement and water are mixed together to make concrete. Maddie uses her special cameras to follow the journey the ingredients take from the quarry to the plant where everything is mixed together. We see how the mixing lorry then takes the concrete to the building site and how it is poured to make a road!
Source: CBeebies
Most recent episodes of Do You Know?
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Series 3: 7. Butterfly And Wallpaper
Maddie is finding out about repeating patterns. She visits a butterfly sanctuary to learn how the life cycle of a butterfly works. Maddie uses her special microscope camera to s ...
26-05-2026
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Series 3: 6. Bridges And Playground Flooring
In today’s episode Maddie is going high and low! She takes her special 360 camera to the top of the longest suspension bridge in the UK to find out how it works. Maddie di ...
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Series 3: 5. Singing And Trombone
Maddie visits a singing group and the children help us find out how we use our mouths, vocal chords and lungs to make different sounds when we sing and speak. Maddie uses a spec ...
22-05-2026
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Series 3: 4. Day And Night And Solar Panel
Maddie explains how the Sun doesn’t move when we go from day to night, but how it’s the Earth turning on its axis that makes the sun appear in the morning and go awa ...
21-05-2026
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Series 3: 3. Car Engine And Car Transporter
In today's episode Maddie finds out about cars. She heads to a car engine factory and with her special cameras finds out how blocks of aluminium metal are melted and made into a ...
20-05-2026
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Series 3: 2. Plant And Compost
Maddie is finding out about the life cycle of plants! She visits a gigantic tomato growing farm and uses her special time-lapse camera to discover how a plant germinates from a ...
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Series 3: 1. Skyscraper And Flying Bird
Maddie finds out how really tall buildings are made out of steel and concrete. She visits a skyscraper construction site to explain how the concrete columns that are buried deep ...
18-05-2026
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Series 2: 25. Refrigerator And Mushrooms
In today's episode, Maddie is at home to show us how a refrigerator works. She explains how the pump and the long pipes inside a fridge change a cooling liquid into a gas to hel ...
15-05-2026
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Series 2: 24. Barcode And Fish Cake
In today's episode, Maddie is visiting a supermarket, where she finds out what barcodes are and how they work. At the checkout, we learn how an infrared scanner reads barcodes t ...
14-05-2026
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Series 2: 23. Prosthetic Limb And Detection Dog
In today's episode, Maddie is looking at the way things are made or trained to help us. First, she meets seven-year-old Anu, who uses a prosthetic leg. Maddie visits a workshop ...
13-05-2026
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Do You Know?
Series 2: 24. Barcode And Fish Cake
In today's episode, Maddie is visiting a supermarket, where she finds out what barcodes are and how they work. At the checkout, we learn how an infrared scanner reads barcodes t ...
14-05-2026
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Do You Know?
Series 1: 11. Popcorn And Pasta
Maddie explores some favourite foods. She uses a special slow-motion camera to find out why popcorn pops. An animation shows what popcorn is made of and how a water droplet hidd ...
17-07-2025
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Series 2: 19. Television And Carpet
In today's episode, Maddie is relaxing at home, playing games and watching television. She shows us how a television screen works using millions of tiny squares called pixels. U ...
07-05-2026
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Series 2: 20. Kite And Wind Turbine
In today's episode, Maddie is outdoors finding out about things that use the wind. She finds out how a kite works when it flies high in the sky, shows us how to measure the wind ...
08-05-2026
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Series 2: 16. Posting A Letter And Colouring Pencils
In today's episode, Maddie is sending a letter in the post to the CBeebies house. She finds out how posting a letter works as she follows the letter's journey from the post box ...
04-05-2026
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Maddie's Do You Know: At Christmas: 1. Reindeer And Christmas Decorations
Maddie goes on a Christmas adventure as she meets Santa's favourite helper, the reindeer, and discovers how Christmas decorations are made. She learns how reindeer keep warm in ...
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Series 2: 14. Playground And Plant Pot
In today's episode, Maddie is having fun outdoors. First, she's in a playground learning how we keep swinging on a swing and how gravity helps us slide down a slide. She uses a ...
30-04-2026
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Series 2: 11. Aeroplane And Trainers
Today, Maddie is on the move. She gets on board an aeroplane and shows us all the buttons inside the cockpit and how they work. Then she sits alongside Bridget, a pilot, in a fl ...
27-04-2026
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Series 2: 18. Lift And Spacesuit
In today's episode, Maddie is finding out about things that go up and down. She shows us how a lift works, when it carries people up and down between floors of a building. With ...
01-05-2026
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Series 2: 23. Prosthetic Limb And Detection Dog
In today's episode, Maddie is looking at the way things are made or trained to help us. First, she meets seven-year-old Anu, who uses a prosthetic leg. Maddie visits a workshop ...
13-05-2026
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