If we keep something for many days in a closed cupboard dust comes on it . cupboard is closed then from where the dust comes. and why?
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In this world nothing is perfect done by humans and machines except nature but the cupboard is made by humans right therefore it has some space right in the corner of it which makes a narrow lane for air to enter in it and you know that air also carries dust within it so after being closed the materials inside the cupboard gets dusted...
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