Catch up TV
Series 1: 8. Blood Pressure Monitor and Cast
Maddie visits a hospital. She uses a special light to see the blood vessels under her skin and finds out how a blood pressure monitor works to check that blood is flowing freely around our bodies. Maddie then visits the plaster room and shows how a cast is made by having one put on her arm. She uses a special microscope camera to reveal how the fibreglass strands are woven together to make the cast strong.
Source: CBeebies
Most recent episodes of Do You Know?
Do You Know?
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 ...
29-08-2025
CBeebies
Do You Know?
Series 2: 15. Disco Ball And Jigsaw Puzzle
In today's episode, Maddie is having fun. She takes to the dance floor to show us how a disco ball works. We learn how light is reflected in lots of different ways, and a specia ...
28-08-2025
CBeebies
Do You Know?
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 ...
27-08-2025
CBeebies
Do You Know?
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 ...
26-08-2025
CBeebies
Do You Know?
Series 2: 12. Traffic Lights And Emergency Lights
In today's episode, Maddie is looking at useful lights. She shows us how traffic lights work so that vehicles can travel safely through a road junction. She visits a traffic con ...
25-08-2025
CBeebies
Do You Know?
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
CBeebies
Do You Know?
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
CBeebies
Do You Know?
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
CBeebies
Do You Know?
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
CBeebies
Do You Know?
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
CBeebies
Most popular episodes of Do You Know?
Do You Know?
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
CBeebies
Do You Know?
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 ...
26-08-2025
CBeebies
Do You Know?
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 ...
27-08-2025
CBeebies
Do You Know?
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
CBeebies
Do You Know?
Series 2: 15. Disco Ball And Jigsaw Puzzle
In today's episode, Maddie is having fun. She takes to the dance floor to show us how a disco ball works. We learn how light is reflected in lots of different ways, and a specia ...
28-08-2025
CBeebies
Do You Know?
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
CBeebies
Do You Know?
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
CBeebies
Do You Know?
Series 2: 12. Traffic Lights And Emergency Lights
In today's episode, Maddie is looking at useful lights. She shows us how traffic lights work so that vehicles can travel safely through a road junction. She visits a traffic con ...
25-08-2025
CBeebies
Do You Know?
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
CBeebies
Do You Know?
Series 1: 15. Crane And Bricks
Maddie visits a building site. She uses a special camera to see how a big crane works to move heavy objects from one place to another. An animation shows how the hydraulic mecha ...
23-07-2025
CBeebies