One great thing about the controversial sciences is that they distract from the fact that we don’t have any idea how gravity works.
Here’s as good a time as any to explain the difference between facts and theory as Science! understand them. The facts of gravity are well established. We have airplanes and rockets and guillotines all based on our understanding of what gravity does. It’s the theory of gravity (“gravity is only a theory!”) — how gravity works so as to make those facts — that’s kinda underdeveloped. Maybe it’s mass curving space time — though that doesn’t really explain all of it. There is also the suggestion of something called “gravitons” being involved, but that’s kinda like saying tiny invisible elves do it. Which we haven’t ruled out.
Gravity holds the entire universe in place, so it’s pretty frustrating to not really know how it’s doing it so we can make cheap knock off gravity if needed. We don’t know how we angered Science! so that it still won’t reveal to us something so fundamental as how gravity works — maybe it’s the scientific inaccuracies in the Flintstones cartoon — but we will have to work hard to appease Science! with out rationality. Until then, we just assume the facts of gravity are consistent, but if one day you’re struck on the head by a bird that was knocked unconscious by an apple falling upwards, it’s not like we can say for certain that can’t happen.