How Exactly Does Smoking Kill? Finally, a simple answer to every child’s question! Paolo Di Trapani, professor of optics from the University of Insubria, explains why the sky is blue. Share this video if it helped you to understand! Facebook Prev Article Next Article Discover Checkout these cool gadgets... Related Posts Inside the International Hunt for the Ghost Particle Why you shouldn’t trust successful people’s advice 24 Accidental Scientific Discoveries That Changed the World The Machine Used to Type Fast in Court Rooms Why do taxpayers pay billions for football stadiums? Ever Wondered Why Rivers Curve?