Science can not explain ghosts

This is because of the definitions of science. Not because ghosts do or do not exist. Physics has been separated from metaphysics, and science just doesn't go there.

The typical scientific response to overwhelming evidence of ghosts is to say its all an illusion. Smoke and mirrors. A parlor trick.

Ghosts, and encounters with other entities has been going on for millennia. Records of sightings, of moving objects, of speech, of information that only the dead person would know... the evidence is mountainous.

But, even in the face of mountainous evidence, science has to deny it.
Further, there is a group that is trying to keep mankind from understanding the world. And this group has taken over "science" and turned into "scientism." Where everything is wrong, but it is "scientifically proven".

Now, ghosts and other entities are all around us. All of the time. If we ever really learned about ghosts, what would happen is that we would learn how to deal and react to ghosts. Its no different than any other human interaction.

Ghosts, also are a single word used to describe multiple phenomena.
There are memories of tragic events. These memories are actually stuck in the place where they happened. Such as old battlefields. Sensitive people who go into these areas often feel, or see the memory play out again.

There are people who died but are still hanging around. This is the closest to what we usually describe as ghosts. And many times these entities go on living their lives as if nothing happened. In such places, people often report things getting moved.

There are other entities. Demons and angels for one, that live in the same space, but don't take up any space in our space. Just think, each person has at least three angels that are always with them.

I am pretty sure that mankind will learn to perceive and interact with all of these entities in the future. And then, it will just be common knowledge that they exist.