How do you build skyscrapers?
What happens when you push the button at a pedestrian crossing?
Those are the sorts of questions science writer Laurie Winkless has gone after in her book Science and the City that was published last year. She calls her book a scientific love letter to the great cities of the world and she's just moved from London to Wellington. Laurie talks to Jesse about fatbergs, self-cleaning buildings and houses made from plastic waste.