Subscribe and 🔔 to the BBC 👉 https://bit.ly/BBCYouTubeSub Watch the BBC first on iPlayer 👉 https://bbc.in/iPlayer-Home The spectacular sight of mountain goats defying gravity on a vertical dam wall in Italy, and all because they are have a craving for some of Earth's elements essential to life. Professor Brian Cox combines some of the most spectacular sights on Earth with our deepest understan
