When Max Koch opened a bottle of homebrew beer one afternoon in Göttingen, Germany, he wasn’t just cracking open a drink. He ...

This was because the clear glass allowed UV rays to penetrate the beer and alter the flavour. The solution was turning bottles brown, a darker colour which would block out the rays. After World ...

After opening the bottle, the dissolved carbon dioxide starts to form inside the beer and triggers the liquid ... than the resonation if you blow on the full bottle like a whistle," said Koch.