When there is no proof, scientists use evidence to make theories.
In general however, there is no consensuses among scientists whether there is or isn't fate.
This is something that has to be proved before it can be made fact.
Even "proof" of a theory is based on mere evidence. Certain hypotheses don't have sufficient evidence at this time (and maybe never will) to be considered as true.There is no scientific evidence for many things, because science can't explain everything.
I think consciousness is in this category. Just as we will never know what energy or entropy or space or time is; likewise for consciousness.
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