Do you think that given enough time, science and/or rational thought will be able to explain EVERY mystery in life? Are you so rational that you define the mysterious as mere unexplained natural phenomena?
How can we know the answer to that?
We might try looking at what history shows us. So far, that has been the case. The best guess is; yes.
The question is: Are we capable of explaining
every mystery. Maybe the universe
is queerer that we can imagine. Maybe we will answer
all the mysteries we stumble across simply because there will be some we can't even recognize.