Actually you can eat silver and gold, colloidal silver can be made at home with a low voltage power source in relative ease, and a pure silver coin dropped in a carton of milk will preserve it, there are also many other practical low tech uses the average person can replicate and use at home which are easily researched on the internet. Gold can be converted to its mono atomic state and consumed for untold health benefits but this is a much more complicated process known anciently which is only now becoming better understood and utilized.