So to keep a long story short, I started watching Eric Dubay, and I havn't seen evidence to a round Earth myself. So I tried to brainstorm some repeatable/observable/somethingable (that he puts emphasis on) experiments.

He mentioned, in lieu of gravity, that buoyancy is a simpler explanation as to why we are stuck on the ground, ie. less dense than ground but more dense than air, keeping us between the two.

Now from life experiences, using still water as a medium, I know that denser objects sink faster than less dense objects. Using this as a parallel, I started to think that, when I use air as a medium, than more dense objects would fall faster than less dense objects.

So using a ping pong ball, die, baseball, tennisball, balled up sock. I began dropping them from an equivalent height (outstretched arms). I found quickly that my left hand is a bit slower than my right, so I had to start testing from both hands multiple times. After some time it seemed clear that regardless of the items density they landed approximately the same time, even the the ping pong ball and baseball (which i felt had the greatest density difference).

Now clearly my experiment needs to be cleaned up a bit, before i can even claim a result. But I should get a camera on the ground to see even small differences at a level perspective. And I need to remove human error somehow. I should also control the density, with some light plastic containers and just fill them with different amounts of water. Also maybe find some more elevation, so any small difference will be more exaggerated. Also controlling shapes would be good, to exclude different levels of air resistance. Maybe all the objects I have dropped are just at a similar magnitude of density greater than the medium that they fall at the same speed, even so, there should still be small differences.

More importantly I feel it's a simple and quick experiment that everyone can attempt. Thoughts? Suggestions?