They just have to show that there exists some set of experimental conditions for which cold fusion occurs.
It’s not that people are claiming it doesn’t work because there are so many conditions that fail to cause cold fusion. It’s that for each individual set of experimental conditions it has not been replicated. If there is a set of conditions under which cold fusion happens, either we have failed to find it yet, in which case we have no evidence for it, or we have found it, in which case all the replication attempts must have been somehow flawed.
It’s not that people are claiming it doesn’t work because there are so many conditions that fail to cause cold fusion. It’s that for each individual set of experimental conditions it has not been replicated. If there is a set of conditions under which cold fusion happens, either we have failed to find it yet, in which case we have no evidence for it, or we have found it, in which case all the replication attempts must have been somehow flawed.
hidden variable. you can’t control for things you don’t know about.