Teaser: In 1977, two planes collided on the runway at Tenerife Airport. Why did the crash happen? And, given that it took place on the ground, why didn't more people escape? In this new two-parter, Tim Harford explores the most deadly aviation accident in history. Both episodes are available now, ad-free, exclusively for subscribers to Pushkin+. If you're not already a subscriber, you can sign up for Pushkin+ on our Apple podcasts show page, or at pushkin.fm/plus. Do you have a question for Tim? Send it to tales@pushkin.fm and we'll do our best to answer it in an upcoming Q&A episode.See omnystudio.com/listener for privacy information.