Humans have been using it for a variety of tasks for centuries, taking advantage of its properties for things like writing on blackboards etc.
chalk
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15
A hanging thing you put the things on.
shelf
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lifesaver
Give 25 points!
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seesaw
Swap points!
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shark
Other team loses 25 points!
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baam
Lose 20 points!
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Used to mask errors in text. Once dried, it can be handwritten or typed upon. It is typically packaged in small bottles.
correction fluid
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A tool used to measure angles.
protractor
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An object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline.