Hannah Fry tucks into the tech behind food delivery apps like Deliveroo and Just Eat, which are now used by 24 million people in the UK.

Hannah meets the R&D team behind food delivery titan Deliveroo, finds out how pensioners ordering Greggs revolutionised food delivery, and discovers how pizza made us fall in love with the internet in the 1990s.

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.