Variations of the Double Slit?

[DrClaude]

Using my mentor superpowers to reply to a closed thread, I would like to point out that the experiment

I would find it very difficult to respond to someone who challenged me for experimental evidence that Earth's gravity exerts the same force on one kilogram of cold-rolled 1045 steel alloy as on one kilogram of 1018 steel alloy.

is carried out every day in constructions sites all over the planet. If there was a significant difference in gravitational acceleration for different materials, architects' and engineers' calculations would be off and no skyscraper would stand up.