For all the scientific marvels humans are capable of understanding, many things remain beyond humanity's comprehension.
Throughout human history, people witnessed various events and scenarios that defy explanation or reason. Without any scientific explanations, these occurrences can only be called "miracles."
Though you hear of most miracles happening during the time of the Old Testament or the Dark Ages, these unexplained moments happen still today in the modern era.
Phenomena like this goes to show humans don't quite fathom all the workings of the universe, if they ever entirely will.