Chalks and dusters
Reshma Maurya - IIT Kanpur
Chalks for writing on a blackboard/greenboardis a bad design :
- The dust coming out from them causes allergies to many.
- When they become small in size towards the end, they cannot be used for writing and have to be thrown away , causing material wastage.
When the duster gets saturated with the chalk dust, it has to be banged against a surface to get the dust out, thus emitting all of it into the near environment and creating dust allergies for others.
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