The experiments
TGD based explanation in terms of hierarchy of Newton's constants
A little digression: Galois groups and genes
Does fountain effect involve non-standard value of G?
Does Podkletnov effect involve non-standard value of G?
Did LIGO observe non-standard value of $G$ and are galactic blackholes really supermassive?
Is it possible to determine experimentally whether gravitation is quantal interaction?
Conscious experiences about antigravity