Science has a lot to say about life and death. Doctors can carry out an autopsy before the deceased starts to decompose, to establish the cause of death. Forensic scientists collect evidence after a homicide. Does being dead mean that your heart stops beating or your brain stops being conscious? Your body is just a machine to carry your brain around, but if you are in a coma you can be pronounced 'brain dead', even though your heart and lungs keep working, a bit like a zombie. And when you die, what about the afterlife..?
In 2012 Felix Baumgartner ascended 39km into the stratosphere for a record-breaking space jump, but he would not have made it back to Earth alive without being protected by his pressure suit and helmet.
A network of compassionate volunteers caring for their terminally ill neighbours is helping more people in Kerala, India, to end their days at peace and at home. Jeremy Laurance meets the man leading the movement.