Soul and the law of conservation of mass energy

"Descartes’s notion of the soul did not work out very well with physics either . The problem is this: if a non physical soul causes events to happen in a physical body , or vice versa, then the law of conservation of mass energy is violated. The trouble is, so far anyhow , that law seems very resilient against all comers. Well , maybe—just maybe—it does happen . But how? Even very roughly , how? How can energy be transferred from a completely non physical thing to a physical thing? Where does the soul get its oomph to have such an effect ? What kind of energy does a soul have? Is it measurable? If not , why not? Descartes, interestingly , was fully aware of that particular problem and despaired of ever solving it ."