The Secret Genius of Modern Life Episodes Available now

Motorway—Series 3
5/5 Hannah drives to the National Highways control centre for the UK’s busiest motorway.

Doorbell—Series 3
4/5 Hannah heads to Los Angeles to takes a deep dive into doorbell history.

Rollercoaster—Series 3
3/5 Hannah Fry uncovers the wild origins of the modern-day rollercoaster.

Air Fryer—Series 3
1/5 Hannah looks at the air fryer – a device that is rapidly taking over people's kitchens.

Fridge—Series 3
2/5 Hannah hits the production line to find the lifeblood at the heart of every fridge.

Lift—Series 2
6/6 Hannah examines the lift, entering a 246m high lift shaft to test her fear of heights.

Headphones—Series 2
5/6 Hannah Fry finds out how today's teeny earbud technology works.

Microwave—Series 2
4/6 Hannah Fry discovers the hidden WWII radar technology that heats up baked beans.

Smartphone—Series 2
3/6 Hannah uncovers the technological game changers that have made the smartphone a reality.

Vacuum Cleaner—Series 2
2/6 Hannah takes a look at the vacuum cleaner, going behind the scenes with Dyson.