THE ANSWER IS 30

 

And so we see that the science problem of Darwin's and Wallace's claim of miraculous virgin brained dual independent conception of a prior published theory, which both admitted was essentially the same as their own, and which Wallace wrote was even more complete, is solved by disproving the consensus that 0 people read Matthew's theory before they replicated it. Hence, any notion that mysterious forces govern the affairs of humans with otherwise amazing improbable coincidences is disproven in this case. The solution to this particular Virgin Conception problem is 30, which is the difference between 0 and 30. Hence there were 30 routes for knowledge contamination to impregnate the brains of Darwin and Wallace with Matthew's bombshell breakthrough.

From this example, we can learn how to solve the science problem of the Christian belief claim in the virgin conception of Mary with Jesus. All we need to find out is how many probably fertile human males were in a position to impregnate her.