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Beginning of use of pen and ink marked the start of new era of easier recording of information. Without them, early scientific discoveries would be forgotten and development of humanity would be much slower.
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.
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.
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.