Karen
3. How come no one has invented a personal force field so I could mingle in public and not be affected by others' perfume, hairspray or cologne, never mind things like pollen?
They have but it doesn't have that Starwars appeal, they call it a Gas Mask.
They have been in use now for about a century. Then you might try one of these VVVVVVVVVVVVVVVVVVVV