they do exist but they do not harm us... like the gosts in movies do :)

I believe so since there have been scientific evidences of unexplained phenomena through out the world.

Ghosts do exist. Some people say that they live between our world and the afterlife. They can't fully cross over because of something that is holding them back. After all, some spirits are always watching over you. Sort of like angles.

It's theoretically possible, even according to just science and not religion. There's a chance that a lot of the information in our brains could be electrons that hold through the neurons. The questions, to me, are are our brains mostly depending on electric or electromagnetic energy? Does that mean the information could survive after death and if so, how long? There are articles on this. I'll post one soon if I remember.

Ghosts do exist, however, they are shy and do not want humans to see them.

i think they do. I've never myself seen one. But sometimes i feel like i'm being watched or followed in the dark. and I've heard unexplained noises in my house. I have no way of proving and all those hoaxes just make it harder to prove they are real.