Swiss scientists make gold nugget ‘as light as air’

[caption id="attachment_839865" align="aligncenter" width="600"] The 20-carats gold nugget floats on top of milk foam. (Photo: Gustav Nyström and Raffaele Mezzenga | ETH Zurich)[/caption] A team of Switzerland-based researchers have created a gold-foam material from protein fibres derived from milk that is...