PU synthetic leather (also known as bi-cast leather, bycast leather or artificial leather, sometimes described as split leather) is a material made with asplit leather backing covered with a layer of polyurethane (hence the term PU leather) that is applied to the surface and then embossed.
Constitution Daily. How a C-grade college term paper led to a constitutional amendment. The 27th Amendment is the most recent amendment to the Constitution, and its existence today can be traced to a college student who proposed the idea in a term paper and was given a C by his professor for the idea.
As a result, the needed number was eventually reached and this amendment, first proposed in 1789, became the 27th (and most recent) amendment to the U.S. Constitution in 1992. Richard E. Labunski, James Madison and the Struggle for the Bill of Rights (New York: Oxford University Press, 2006).