copper

Simon Dawson/Bloomberg

A trader speaks on fixed-line telephones on the trading floor of the open outcry pit at the London Metal Exchange Ltd, in London. Photo Simon Dawson/Bloomberg 

Opening the Olympics collection

Geoff Caddick/PA Wire

Laura Mitchell of the Museum of London holds one of the prototype copper petals of the London 2012 Olympic and Paralympic cauldron before it goes on display as part of the museum’•s Opening the Olympics collection, later this year