No one knows what happens when you die. Most believe that there is something after death, that the consciousness lives on when the body died. Whether souls go to heaven, hell, or an astral plane of ether, people by and large think they go somewhere. If the consciousness does live on, then it raises an interesting possibility. It makes it possible that the living and the dead can actually communicate with each other.
A full 79% of Americans believe that it is possible to speak with the dead, according to a 2005 Gallup poll. The means of communication range from dreams to mediums. Many people have lucid dreams, dreams in which the dreamer is perfectly aware it is a dream. In such dreams, a person may be visited by a deceased loved one and converse with them.
People also often try to speak with the dead through the use of mediums. A medium is a person who channels a spirit through their body and the spirit uses their body to communicate with the land of the living. The classic picture of a séance is an example of speaking with spirits through a medium. The psychic medium is more attuned to the spirit world and therefore has an easier time relaying communications across the divide.
Psychic but Sane, How the Dead Communicate With Us: http://www.psychicbutsane.com/mediumship-and-the-afterlife/how-the-dead-communicate-with-us
Daily Mail, Engineer ‘Talks’ to His Dead Teenage Daughter After Developing Paranormal Detection Devices: http://www.dailymail.co.uk/news/article-2134547/Hi-Daddy-I-love--Engineer-talks-dead-teenage-daughter-developing-paranormal-detection-devices.html
Access News, A Do It Yourself Guide to Communicating with the Dead: http://accessnewage.com/articles/vario/LOTTALK.HTM
Cracked, The Supernatural: http://www.cracked.com/funny-7360-the-supernatural/
Thank You, What is the “Supernatural”? http://www.chabad.org/library/article_cdo/aid/356494/jewish/What-Is-the-Supernatural.htm