With the 95th Academy Awards just around the corner, Tim Harford looks back at a basic lesson. Galileo tried to teach us that adding more and more layers to a system intended to avert disaster often makes catastrophe all the more likely. This principle has been ignored in nuclear power plants, financial markets and at the Oscars... all resulting in chaos. For a full list of sources for this episode, go to timharford.com. Listener questions Tim is taking your questions. Do you have any queries about one of the stories we've covered? Are you curious about how we make the show?  Send in your questions, however big or small, and Tim will do his best to answer them in a special Q&A episode. You can email your question to tales@pushkin.fm or leave a voice note at 914-984-7650. That's a US number, so please be aware that if you're calling from outside the US international rates will apply.See omnystudio.com/listener for privacy information.