<http://schema.org/about>
"Even the most incredible light bulb technology cannot compete with the warmth -- and energy-efficiency -- of natural light. The only problem with natural light is that not every house has been built with daylighting"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/tubular-skylights-for-ad-hoc-daylighting-are-totally-cool.html>