<http://schema.org/description>
"Pain is subjective \u2014 what is excruciating to you might be tolerable to me. Which is why it&amp;#039;s so difficult to measure and control."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/life/inside-the-mind/human-brain/measure-pain.htm>