The Secret Genius of Modern Life Season 3 Episode release dates & where to watch

1. Air Fryer

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.

2. Fridge

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.

3. Rollercoaster

Hanna 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.

4. Doorbell

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.

5. Motorway Finale

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.