You thought you could get rid of those old Legos, but wait! They will likely outlast you and your great-great grandchildren. Scientists gathered Legos found on a beach in England and analyzed them. Based on a chemical used to color the yellow ones, it was estimated that the Legos were 40 years old and had been lost at sea and washed ashore. The yellow pigment was discontinued in 1970 so they knew these Legos were old. After carefully measuring each type of Lego they found only a small percentage of wear. Based on estimates it would take anywhere from 100-1300 years to have them completely wear away.