What makes glass or water transparent (what is the scientific explanation for this)? Do you think it would be scientifically possible for a man to become invisible, or transparent? (Keep in mind that writers of science fiction have often turned out to be prophetic in their imagination!)

When a ray of light passes through a medium without deflecting its path, the medium appears as a transparent medium. Light passes though glass or water without any deviation (or least deviation), this makes glass or water transparent.
The man becoming invisible is currently just an imagination. It would not be possible and can just be imagined. There are so many things that can be felt but not seen. Scientifically it would not be possible for a man to be invisible.

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