It was my understanding that science presupposed nothing, but made the single demand that any hypothesis be testable.
If a way to verifiably and objectively test for something could be demonstrated then someone somewhere is likely to put it through the scientific process.
If science seems to presuppose only natural causes for observed events, that’s because there has been no credible objective means of testing for supernatural causes put forward that have yet yielded objective conclusive evidence for the supernatural. (if there had been then the
James Randi Organisation would have paid out by now)
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