Nobody decides. A ball doesn't fall to the ground a million times out of a million because some central governing body says it should. Gravity is an observation. There are theories that attempt to explain its nature, but even then you don't have somebody "deciding" what is correct. So if for instance someone builds a spacecraft built on the Einstein theory of gravity, their spacecraft will likely succeed, whereas when someone builds a spacecraft based on the pixie dust and prayer theory of gravity, their spacecraft will likely never leave the ground. From then on you'll see intelligent people follow the Einstein model, and everyone else will fail.Some of the most evil people I have ever known and read about would be considered 'intelligent'. And I am not referencing Einstein or anyone in particular, just my observations. Common sense tells me if God gave the instruction to build a spacecraft He would give His specifications.
So where is Einstein now?