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One of the things that make our human civilization what it is writing. Without it, great ideas would be forgotten, information would stay at the place where they originated and we would have to invent things a thousand times over. To write we have writing implements that changed throughout history.
When schools and classrooms started to grow, in 19th century, a problem appeared: how to transfer lectured information to a greater number of students. Solution was at first in a blackboard and chalk and later in whiteboard and whiteboard pen. Read more about history of blackboard chalk and whiteboard pen.
Mechanical pencils are also old invention dating even from 16th century. First ones were relatively simple mechanisms, only to become more complicated with time. Today we have mechanical pencils which can write and draw very precisely.
Digital Pens enable users to digitize their writings instantly on real paper, drawings and quick scribblings, share them online or edit them for professional use. Find out much more about this technology here.