Where does Dubay get the idea that we don't feel gravity pulling us down to the ground? He can try my job for an hour, sheesh.
And, did the bumbling bee video writer not notice that the double wings of the bees are half their body length? There is still gravity. If the body of a bee was carrying a full load (or not) and died, at that instant the mass of the body would plummet directly to earth. Levitation or not.
This FE material is hooey.