Koksvik is especially concerned with the argument that interactionist dualism can't work because for it to do so would violation the law of the conservation of energy (supplemented perhaps by the law of the conservation of angular momentum). The idea behind this argument is that IF my thoughts cause me to do something I wouldn't otherwise do, then they must do so by exerting energy. Energy after all is that which does work, that which which moves matter around. Thus, if interactionism is true, energy is leaking into the phenomenal world from some trans-phenomenal source. Surely this would violate that law. If we're going to say, "so much the worse for the law then!" we can do so. Laws sometimes have to be modified and sometimes abandoned. Still, these leaks of energy into the phenomenal world should be in principle detectable, and anyone arguing for interaction should be able to make a case that they exist, that the law is violated, before arguing for ...