If an explanation known by other people implies that other beliefs we hold are false, then word will sometimes get around, so really novel knowledge can be expected to have a greater impact on our beliefs. A light spell that could be replicated and used to claim the Randi Prize would force us to massively increase our estimates of the likelihood that we are living in a simulation and revise numerous other beliefs.
If an explanation known by other people implies that other beliefs we hold are false, then word will sometimes get around, so really novel knowledge can be expected to have a greater impact on our beliefs. A light spell that could be replicated and used to claim the Randi Prize would force us to massively increase our estimates of the likelihood that we are living in a simulation and revise numerous other beliefs.