Irrelevant, the reason an object falls in a vacuum is because there is nothing in the vacuum. If you put a helium balloon in a vacuum it's not going to rise is it?.. the helium is obviously going to be

You said, "Take a quarter, hold it in your hand in front of you. Let go. It falls at 9.8 m/s because of gravity." And I am saying that that's an assumption. The reason the quarter will fall is

And what do you mean flagging? I didn't flag your comment, I clicked on the thumb down button... that is it. And I thumbs downed your comment because you referred me to a video that was completely irrelevant.

That's all assumption, objects, such as a quarter, fall because they are heavier than the air in which surrounds them, the same way as a helium balloon rises, it rises because it is lighter than the air

Can you practically demonstrate gravity? If not then its a theory and not a fact, which is pseudo science. Science must be observable, testable and repeatable.