These are call believes. In malaysia certain race are force to follow without obligation.
Honestly i do believe in ghost before i felt it before at least 4 times all my life. Its something unexplainable. For no reason in a quiet place suddenly u feel chill. Then suddenly you have this feeling keep telling yourself Pls get out of the room.

Another one was a room i always entered a TV ROOM. I didnt think anything bad or scary but when i sleep there i have nightmare tat something is in the room. I woke up with chills and sweating. If someone tell you that room is haunted and u still sleep there its call scaring yourself but
I also have a friend that can see these things. When she all of a sudden just keep quiet i immediately understand

Its not 100% ghost but its just something that cant be explain yet in scientific yet or havent have the technology to do so.

How do you know its a ghost? The word ghost is created by u? Its something unexplainable.

The word god created by who? Also human. Suddenly everyone born then suddenly in their mind have a word call ghost and god?

Its a believes. When our parents are growing up they guide us a method. Then everyone follow it that creates a believes.

It's kinda true, you have to accept that some diseases science (still) does not have the cure.
But the truth is, every disease has its' cure.
Just because it has not been proven scientifically,
does not mean it does not exist.
Just how many percent of our brain are we using, man? Do you think we will and can know it all?

"Nothing exists until or unless it is observed. An artist is making something exist by observing it. And his hope for other people is that they will also make it exist by observing it. I call it 'creative observation.' Creative viewing." -William S. Burroughs

I think the same principle also applies to Scientist.

Now, you can try to explain the taste of kiwi juice to people who never taste kiwi juice, but do you think he will understand? huhu~

those "nerds" aren't trying to prove something.
experiments are going on to discover new knowledge, cures and remedies, ways to enhance our lifestyle.
imagine a world without scientist and doctors? those "nerds" are the very foundation of mankind.
if every1 chose not to believe in science and the "nerds", this world would still be in the stone age.
if it takes science 500 years to prove , your descendants and the rest of mankind will have the benefit, so its not a total lost.

if science could heal every disease then wouldn't mankind be playing god?
there are many incurable diseases in these world, most of them are congenital..  and some lay dormant and manifest at a later stage of life.
these things are out of our control...

in addition to that, i don't think there is anything called as a "non science" method, even in alternative medicine.
its a stepwise process, first comes observation, next comes hypothesis, experiment, reproducibility, inference.
every person has a choice, if they opt for alternative medicine they are free to do so.. "they don't have to wait for science to proof it could be healed"

finally, to believe in the advancement science and to believe in a different kind of existence (ghosts) differs from people to people.
skeptics tend to look for a scientific explanation.. (though there isn't really 1)
while believers think otherwise.. but it isn't fair to disregard the other fields of science.
science is such a general and broad term. it covers, medicine, mechanics, aviation, ai , etc..etc..
i myself think that paranormal science and studies hold very little significance.. however, i do believe that the other fields of science has benefitted mankind in many ways.

Sorry, but I've always felt answering a question with another question isn't the best way to justify oneself.
Let us view the fallacy of your viewpoint, and hence compare here:

1. Newton realises there's cause for things to fall. (So far, realisations of ghost only occurs to a minority group of people)
2. He then conducts experiment as to why things fall. (There've been experiments trying to detect ghosts as well)
3. Results of his experimentation concluded there exists a gravitational force. (Still no results from here).

The main difference here is item no.1, the realisation of the subject. Things fall, it's imminent/obvious/real.
Ghosts, on the other hand, is not.
Thus there're still difficulty in trying to gauge something which might/might not exist. Which is why I propose that we'd firstly discuss whether or not ghost exists.

Erm, what I meant in realisation is that the process/experiment can be repeated and certain observations can be made.
Perhaps this also falls under the category of 'Seeing is believing.'

One can observe the effect of gravity pretty clearly; Object falls. Period.
But the effect of ghost is not very much observable.

Hope you get what I meant

@nice.rider: Rather interesting ideas, but perhaps I'll discuss it later. Brain's still asleep; just woke up from nap *yawn*