Prof Hannah Fry examines the kitchen phenomenon in her fascinating tech series. Plus: Rose Ayling-Ellis’s emotional signing project. Here’s what to watch this evening

8pm, BBC Two
Yet another show about the air fryer – but it’s OK, because this time it’s to kick off the brilliant Prof Hannah Fry’s third tech series, in which she examines seemingly ordinary objects in “obscene detail”. And this isn’t about just recipes. Fry – a self-confessed convert – traces the origins of the kitchen phenomenon back to the “accidental creation of a ‘wonder wire’” in the 1900s and one first world war pilot’s need for a hot dinner. Hollie Richardson