An observation about sand and fine sand

[Samw]

Albert: I told several people with aches to take aspirin. They did and their pain went away.

Person 2: Wrong Albert. I don't have any aches and I didn't take any aspirin. Therefore aspirin doesn't work.

Person 3: Wrong Albert. I don't have any aches and I didn't take any aspirin. Therefore they don't need to take aspirin to not get aches.

Person 4: Wrong Albert. Aspirins don't relieve pain but they should take more vitamins. This is the reason I don't have aches.