<http://schema.org/alternativeHeadline>
"Whether you go out stargazing or simply relax in the dark at home, spending an hour without power Saturday night might just re-energize your weekend."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/energy/blogs/earth-hour-2012-the-dark-night-rises>