Catch up TV
Series 1: 5. Bike Chain and Tennis Ball
Maddie is outside being active. She uses a special camera to find out how the chain on a bicycle works to turn the wheels and how the front wheel and handlebars are used to steer. Next, Maddie visits a factory to see how rubber, collected from trees, is made into tennis balls using a series of heavy presses. A microscopic camera reveals the special material used to cover the tennis balls with a furry coat.
Source: CBeebies
Most recent episodes of Do You Know?
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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 ...
22-08-2025
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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 fi ...
21-08-2025
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Series 2: 9. Handwash And Vacuum
In today's episode, Maddie is cleaning up. She visits a factory where hand wash is made and uses her special camera to see inside a big vat to see the colour being mixed. Next, ...
20-08-2025
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Series 2: 8. Train Tracks And Paint
In today's episode, Maddie is at a train museum finding out how signal boxes work and how trains are moved from one track to another to get to the right place. Maddie puts her s ...
19-08-2025
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Series 2: 7. Canal Lock And Gate
In today's episode Maddie is finding out about different gates that open and close. She visits a canal lock to find out how canal boats travel up and down hill. Maddie jumps abo ...
18-08-2025
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Series 2: 6. Sleeping Bag And Mattress
It's bedtime and Maddie is finding out about different things we sleep on and in! At a campsite she uses a special thermal camera to show how the layers in a sleeping bag work b ...
15-08-2025
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Series 2: 5. Opticians And Glasses
Today, Maddie is finding out how wearing glasses helps us to see more clearly. She visits an optician to see how an eye test works by having one herself. She reads the charts an ...
14-08-2025
CBeebies
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Series 2: 4. Clock And Cutlery
Today, Maddie is finding out how clocks tell the time. She heads to a clock factory and uses a special time-lapse camera to show how the hands on the clock move around. Maddie a ...
13-08-2025
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Series 2: 3. Ice Rink And Bouncy Castle
Today, Maddie is having a fun day out. She uses a special thermal camera at an ice rink to find out how runny water freezes to make solid ice we can skate on. Next, Maddie heads ...
12-08-2025
CBeebies
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Series 2: 2. Umbrella And Carwash
Today, Maddie is having fun with water. She takes a car through an automatic car wash to find out how the computer uses sensors to tell the robotic car wash how to wash the car, ...
11-08-2025
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Most popular episodes of Do You Know?
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Series 3: 17. Lighthouse And Bathbomb
Maddie is at the coast! She visits a red and white striped lighthouse and meets the lighthouse keeper right at the top. She goes inside to where the bulb is kept and finds out h ...
28-11-2023
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Series 1: 2. Fire Engine Hose And Reflective Strips
Maddie looks at the emergency services. She uses a special camera to find out how the hose on a fire engine works and how the pump inside the fire engine creates pressure and se ...
07-07-2025
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Series 1: 6. Cat Flap And Woolly Hat
Maddie meets some furry friends. She uses special cameras to find out how a digital cat flap works and how a tiny microchip unlocks the cat flap so the cats can go in and out of ...
10-07-2025
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Series 1: 10. Water Park And Ice Cream
Maddie goes for a fun day out. She visits an indoor water park and uses a special waterproof camera and animation to show how a water slide works. She then goes underneath the s ...
25-07-2025
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Series 4: 5. Drinking Water And Carrot
In this episode, Maddie visits a reservoir that collects water from our homes, natural springs and the rain. She heads to a draw-off tower, which takes water from the reservoir ...
11-04-2025
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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 fi ...
21-08-2025
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Do You Know?
Series 2: 3. Ice Rink And Bouncy Castle
Today, Maddie is having a fun day out. She uses a special thermal camera at an ice rink to find out how runny water freezes to make solid ice we can skate on. Next, Maddie heads ...
12-08-2025
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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 ...
27-06-2025
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Series 1: 23. Car Brakes And Car
Maddie goes for a drive in the car. She uses a special microscope camera to find out how car brakes work. An animation shows how the brake pedal is connected to the brake discs ...
05-08-2025
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Series 2: 13. Hairclippers And Ballet Shoes
Today, Maddie is dressing up. She visits a barber to find out how clippers work to cut hair. Using a special microscope camera, Maddie shows us how the blades work, and a slow-m ...
24-06-2025
CBeebies