Zothecula writes: Along with its use in jewellery, gold also has numerous applications in fields such as electronics and scientific research. It's a handy material, but – of course – it's also expensive. That's why researchers at ETH Zurich have developed a new way of making a small amount of gold go a long way. They've created a gold foam that looks much like solid gold, but is actually 98 parts air. As an added bonus, the aerogel-type foam can also be made in non-gold colors such as dark red.