A big question mark for every person is what life after death? A study tried to answer it.

Reported by the Telegraph website, a controversial study conducted by researchers from the University of Southampton in England. They conduct in-depth study for four years to 2.000 people to know is there any life after death. They select those patients with heart disease from 15 hospitals in the United Kingdom, United States, and Austria.

The researchers get results, that nearly 40 percent of patients whose heart stops working, then successfully revived, having consciousness for a few minutes when in the midst of death and life again.

According to one study leader, Dr. Sam Parnia, medically brain can not function when the heart stops beating. After cardiac death, brain death will follow within 20 to 30 seconds. However, these people still have consciousness until three minutes after her death. One of the men confessed out of his body and saw himself back to life. In fact, this 57-year-old man, was able to describe what nurses do to save his life. He even remembers the sound of the engine that is in his room.