<http://schema.org/about>
"Good morning! It's Earth Day! Were you unsure that today is a celebration of 40 years of Earth Days (which would require living under a rock), all you had to do was flip on your computer and head to Google for your search"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/googles-earth-day-doodle-focuses-on-rainforests.html>