Four failed inventions that changed the world

Discover more with the BBC Why do we stand on two legs? The psychology of seduction     Four failed inventions that changed the world     Why we haven't cured the common cold 'What dying taught me'     What is a skeuomorph - and why are they everywhere?     How to be more persuasive Why baldness is so hard to cure     Four things bats can teach us about survival     Understanding the mechanics of hatred What do lucky people do differently?     Climate change: The problem with the enemy narrative     Can’t watch right now? Not to worry, hit the 'Add to saved videos' button and it will be ready and waiting for you in your 'My Ideas' list, so you can come back and enjoy it later. Still curious? Find more videos online

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