<http://schema.org/about>
"About two years ago, I was at a conference and one of the presenters brought up her idea that a significant cause of nearsightedness is the fact that so many of us spend most of the time indoors staring at computer"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/clean-technology/want-to-keep-your-eyesight-study-shows-getting-more-sunshine-is-key-factor.html>