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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Jun 19, 2012. What a WONDERful comment you left for us on this Wonder, Jordan! We really enjoyed hearing all the cool things you WONDER about! An ant can be super small, but it is not the smallest thing we can see without the use of a microscope. There are even smaller things, like the thickness of a single strand of hair, or a tiny louse.