Making a Rio Olympic medal

June 29, 2016 14:39 IST 1 of 5
A worker from the Casa da Moeda do Brasil (Brazilian Mint) takes out gold-plated Rio 2016 Olympic and Paralympic medals in Rio de Janeiro, Brazil, June 28, 2016. Ask athletes what goes into Olympic gold medals, and they will likely say sweat and years of training. For Brazil's National Mint the answer is simpler: recycled silver. Credit: Reuters