Catch up TV
Series 4: 14. Neon Sign and Revolving Door
In today’s episode, Maddie is out and about! She finds out how revolving doors can let lots of people in and out of buildings at the same time. She visits a revolving door workshop to see how panels of glass are fixed to something called a carousel so that the panels move when we push them. Then she uses a special camera to show how a sensor at the top of an automatic revolving door spots us so it can start to turn.\n\nNext, Maddie heads to a neon sign workshop and uses her thermal imaging camera to see how glass is heated until it’s really, really hot. It can then be bent into lots of different shapes. We see how the glass tubes are filled with argon gas – when electricity passes through them, they light up!
Source: CBeebies
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Series 2: 23. Prosthetic Limb And Detection Dog
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Series 2: 22. Hand Dryer And Toilet Roll
In today's episode, Maddie is looking at things we use when we go to the toilet. She visits a factory to see how hand dryers work. She shows us how infrared light is used to swi ...
08-09-2025
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Series 2: 21. Fish Tank And Bath
In today's episode, Maddie finds out about things that use water. She visits an aquatic centre to show us how a fish tank works, using a special underwater camera to explain how ...
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Series 2: 20. Kite And Wind Turbine
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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 ...
03-09-2025
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Most popular episodes of Do You Know?
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Series 2: 22. Hand Dryer And Toilet Roll
In today's episode, Maddie is looking at things we use when we go to the toilet. She visits a factory to see how hand dryers work. She shows us how infrared light is used to swi ...
08-09-2025
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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 ...
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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 ...
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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 ...
15-09-2025
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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 ...
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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 ...
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Series 2: 21. Fish Tank And Bath
In today's episode, Maddie finds out about things that use water. She visits an aquatic centre to show us how a fish tank works, using a special underwater camera to explain how ...
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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 ...
03-09-2025
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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 ...
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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 ...
02-09-2025
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