Gregg Wallace and Babita Sharma lift the lid on the science behind the supermarkets. Gregg finds out how supermarkets decide where to open convenience stores. Show more

Sara Cox and Ade Adepitan have access to some of Britain’s biggest supermarkets and their suppliers to see how their systems have stood up to the most testing time in their history. Show more

Our five senses link us to the outside world. Dr Kevin Fong looks back through 40 years of Horizon archives to find out what science has taught us about our tools of perception. Show more

Nigel Slater and Adam Henson look at the disappearing notion of seasonality in our food, looking at spring lamb and aiming to put us back in touch with nature's food cycle. Show more

Gregg Wallace and Babita Sharma lift the lid on the science behind the supermarkets. Gregg discovers the high-tech acoustic kit being used in the battle for the perfect avocado. Show more

Gregg Wallace and Babita Sharma lift the lid on the science behind the supermarkets. Gregg discovers the exotic ingredient being used to produce a healthier burger. Show more

Actress Ruth Madeley discovers how a law change could prevent many birth defects and how pioneering foetal surgery could transform the lives of babies with spina bifida. Show more

Liz Bonnin and a team of experts conduct a groundbreaking scientific study of cats, revealing how cats experience the world with the senses of their wild ancestors. Show more

Cherry Healey uncovers the health powers of some of our favourite foods. In this episode Cherry tackles the battle of the bulge, testing daily staples that might aid weight loss. Show more

Cherry Healey uncovers the health powers of our favourite foods. In this episode Cherry tests the daily staples that could help with everything from our hearts to our teeth.

A few weeks ago, the National Health Service was hit by a devastating cyber attack - Horizon tells the inside story of one of the most challenging days in the history of the NHS. Show more

Dallas Campbell looks back through the Horizon archives to find out what science can tell us about man's best friend and whether new thinking should change the way we treat them. Show more

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. Show more

Hannah Fry discovers the hidden WWII radar technology that heats up baked beans and learns the legend of the melted candy bar in an engineer’s pocket that kick-started a kitchen revolution. Show more

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. Show more

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. Show more

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

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’. Show more

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. Show more

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. Show more