Spirits

Hello Friends,
Does spirits really exist?Is there anything that exists after our death ?What is a spirit?does death happen when it is destined or it might be the case that those who face death unexpectdly and are not aware even after their death that they are dead, they want to fulfill their wishes and for this they need human bodies to do their tasks.
when people die theyleave their physical body and move to next astral body.... till they reach 7th plance plane their are various physical bodies residing in various palnes..the physical plane is the only visible one and hence the physical body.
There were some experiments done after the second world war because someone claimed that there are spirits of the soldiers and because of it certain lights were seen in the sky just at some height above the ground. So according to one scientist that if there are spirits they will have certain frequencies and thus is plotteda frequency detecting instrument near the groung and observed that it showed somedeflections,it is a true story.
Now let us move towards some scientific explanations of it .When we say that someone
has died .When someone died what actually happens it is said that in medical language his mind
has been colapsed and takes it's thought patterns when it happens then that person is proclaimed as dead and rest of body is burried.
Let it relate with car spirit. Car spirit is associated not only with the fuel but it is associated with the spirit power that is internal to it.
There may be spirit associated with humans when they are still alive .These type of feelings come into when you are in a complete thoughtless situation.And after that when your
mind comes in this physical world.You feel very energetic and enthusiastic.You become more
concentrated.
What are described above may or may not be true in the physical world . Now I am moving towards that spirit that really exists, means think about great persons that even have
died but when we think about them we always says that's spirit.