Table of Contents (click to expand)PencilEraser The pencil was invented in the late eighteenth century by an officer in Napoleon’s army. The pencil is made of a mineral called graphite, which is composed of carbon. The different shades of pencils—BB, HB, HH, etc.—that we see today are obtained by tweaking the mixture used in pencil-making. The eraser was invented in the eighteenth century by British engineer Edward Nairne. The eraser is made of rubber, which is a synthetic material. In our digital age of social media, everything seems closely monitored. As they say, the Internet never forgets. Once it’s on … Continue reading How Does A Pencil Work? How Does An Eraser Eliminate Pencil Marks?