Oh god. Feathers and dust don't float away because they're weightless. They float away because air currents exert forces on them that are greater than their w

Oh god. Feathers and dust don't float away because they're weightless. They float away because air currents exert forces on them that are greater than their weight. Eventually, in a still-air environment, the feather and the dust will settle to the ground. You can verify this by going to your nearest attic.