Where does dust comes from? Identifying the source of dust using a Foldscope

I have been thinking about the dust in my house for a while, does it come from outside or inside homes or both? How much our bodies contribute to it? What all we can find in house dust. Can this information be used to control dust. I did some online research but found contradictory information so decided to do my own little experiment using just the Foldscope and tape.

I have video recorded my experiment, you can watch it here:

Will now try to use this information to control the dust in my home. Let me know what do you think? Did I miss anything important in my experiment? Tell me in replies.

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