After writing my power point presentation on touch, it got me to consider pain and people who cannot experience pain. As it turns out, there are people in the world, although slim, that cannot feel any pain at all. Not even something as far as placing their hand on a burning stove. This is known as a congenital insensitivity to pain. In congenital insensitivity to pain the connection between the nerves that sense pain and the brain's reconition of pain is missing. There is no cure and since it is genetic no way to avoid it.
The video below shows an example of this where a young girl has this disorder. While it seems like she is a good baby who doesn't cry at first, that all changes when you can no longer tell if they are hungry, wet, sick, or have a rash.