Paranormal ≈ supernatural and each/both = patascience(*)
(*) Read about
pataphysic for example.
As for parthenogenesis, it is just normal science and no sientist would rigourously say a parthenogenesis within human-kind would be "impossible", but rather there are lot of mechanisms preventing against such event. In that given case, just a matter of statistic and possibilities.
As for miracle, huh ! Don't think everything is already "written" somewhere along the "natural law". Casualty is a matter of statistic, which is different than determinism. That is why exist theories about parallel universes, each of these universes parting from each possibility than can occure for each event even the less significant. Some of those theories assume the way events happen in our "current" universe/dimension, may be influenced by what is happening in the "nearest" dimensions/universes. That is not as foolish as some of us here would like to make it look.
Moreover, there is a extremely unpredictable phenomenom called
emergence : whatever you can know about a level of natural law or a situation, when complexity reach a certain moment or amount or both, it becomes unpredictable, also qualified as chaotic. Why ? Simply because
order is only a facet from chaos.
So miracles aren't the preserve of religions and such.
And if you believe in determinism, you should learn a bit about thermodynamic laws as for example the failure of the
Laplace's demon versus the
Carnot's principle and the irreversibility of events.
So : no, not everything can be "explained" or rather
foreseen by Science even if you were to know every-
everything about our universe. But afterward (after the events), you may try to "trail backward" those events.
As for Leibniz, to summarize he was saying that if every/each event, even the less significant, happening within our universe is decided by God, then each event would be a miracle -- since it's from God's hand.
Concerning what the universe is originated from, we really lack of facts and thus "proofs". We have no way to reach anything beyond the birth point of the universe.