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Pencil practically cannot be used without some kind of pencil sharpener. Were they simple knives or complex machines with many rotating elements, their purpose is to make a fine point to a pencil. Read more about pencil sharpener history, facts and types.
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.
Highlighters are useful tools: you can use them to mark dates on a calendar, parts of the relevant text in a book or any other use where you need highlight something on paper. Thy influenced our lives so much that we can even find them in some computer programs. Read more about history of highlighters.
Space pen began as a try to achieve a perfect pen. Pen was so perfect that it ended in space as a valuable tool and one of the symbols of humanity’s venture into space. Read more about history of space pens.