What is ghost hunting and how do paranormal researchers gather ghost hunting evidence?

I was told by a scientist that only 1% of the Universe is known and explained. As a lifelong student and a very curious one at that, I have always explored a variety of subjects in my life from physics to astronomy to the spiritual. Naturally, the way I investigate sites reported to be haunted is going to reflect this merging of the scientific method and the spiritual. My hope in sharing my methods for ghost hunting is that it will help expand our knowledge of the universe. M