This 12-year-old from Bhopal, India shows how:
http://www.thebetterindia.com/65874/anakta-prabhu-thermocol-recycling-foam/?utm_source=The+Better+India+Newsletter&utm_campaign=1b75f91961-RSS_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_cd579275a4-1b75f91961-74060141