Doorbell • 2025 • episode "S3E4" • The Secret Genius of Modern Life

59:22

Hannah Fry takes a look at the bank card, the digital key to accessing cash, and finds out how its extraordinary innovations have some surprising and sinister origins.

2022 • Technology

59:15

Hannah Fry tucks into the tech behind food delivery apps, which are now used by 24 million people in the UK. Hannah finds out how pizza made us fall in love with the internet.

2022 • Technology

58:45

Hannah Fry delves into the inner workings of virtual assistants, such as Amazon’s Alexa, Google Assistant and Siri, which are now found in almost half of all UK homes.

2022 • Technology

58:15

Hannah Fry discovers why innovations in meat packing almost derailed the electric car revolution and how a breakthrough in camcorder batteries led to Elon Musk’s electric empire, as well as demonstrating how not to drive a multimillion dollar prototype car of the future.

2022 • Technology

58:48

Hannah Fry finds out how 1970s car crashes helped us to count our steps, why WWII dogfights led to a crucial health monitor and how fitness trackers are even being used to catch killers.

2022 • Technology

59:06

Hannah Fry visits eBay’s authentication centre, where they are waging war against fake high-value trainers. She discovers how American breakfast waffles transformed our trainer soles and how an 18th-century tea set led to the use of celebrity endorsement.

2022 • Technology

59:29

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet.

2023 • Technology

57:43

Hannah takes a look at the vacuum cleaner, going behind the scenes with Dyson and discovering how the motor in their latest vacuum spins nine times faster than that of a Formula One race car.

2023 • Technology

59:04

With rare access to electronics giant Samsung, Hannah uncovers the technological game changers that have made the smartphone a reality.

2023 • Technology

57:57

Hannah Fry discovers the hidden WWII radar technology that heats up baked beans, learns the legend of the melted candy bar in an engineer’s pocket that kick-started a kitchen revolution and puts her life on the line to demonstrate why microwaves zap food but not people!

2023 • Technology

58:48

Headphones: these marvels of miniaturisation are worn by 30 million people in the UK. Hannah Fry visits Bose to find out how the teeny earbud tech works and meets the human testers with ‘golden ears’.

2023 • Technology

58:59

Hannah goes behind the scenes to look at the technology behind the lift, entering a 246m high lift shaft to test everything from the brakes to her own fear of heights.

2023 • Technology

58:45

Hannah takes a look at the air fryer – a device that is rapidly taking over people's kitchens, cooking up everything from bread rolls to baked Alaska and almost making ovens obsolete.

2025 • Technology

59:22

Hannah hits the production line with appliance giants Bosch to find the lifeblood at the heart of every fridge and gets a lesson in carrot droop.

2025 • Technology

59:27

Hannah uncovers the wild origins of the modern-day rollercoaster and gets the inside story on the UK’s newest, tallest and fastest coaster – Thorpe Park's Hyperia.

2025 • Technology

59:02

The rise of the smart doorbell is one of the great tech success stories of the 21st century. Hannah heads to Los Angeles to take a deep dive into doorbell history and talk to market leaders Ring.

2025 • Technology

58:05

Hannah takes a drive to the National Highways control centre for the UK’s busiest motorway to meet the team that keep the motorways running 24/7.

2025 • Technology