Curious about the world of recycling? Here are ten weird and wonderful recycling facts. It takes about three months for a recycled aluminium can to find its way back to the shelf. There is no limit to the number of times this metal can be recycled. In China, over a million unsold CDs by singer Robbie William are going to be used for new road surfaces. Nike converts old trainers into surface material for tennis courts and athletics tracks. Mobile phones containing copper, gold, palladium, platinum and silver worth more than 80 million dollars are dumped in the US every year! During World War II, 33 % of newspaper was recycled. This figure has since declined. If all our newspapers were recycled today we could save 250,000,000 trees each year! In World War 1, recycled corset stays produced enough metal to build two warships. A house built illegally in a slum neighbourhood of Rio de Janeiro by Luis Bispo using plastic bottles and building waste is now considered as an international example of sustainable development. Tanners have used human urine to convert animal hides to leather for centuries. Urine was also used to make gunpowder in the Middle Ages. New laws in the UK require that old electronic devices such as mobile phones, laptops and even sex toys, must be recycled. In Japan, the Denture Recycle Associate extracts metals from used dentures. The profits are donated to UNICEF. If you are interested in learning some more recycling facts and putting your knowledge into action, try getting a Plastic recycling resource pack.