<http://schema.org/alternativeHeadline>
"Do we need nighttime darkness to stay healthy? After finding a correlation between light pollution and increased risk of cancer, researchers say yes."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/healthy-spaces/stories/dont-be-afraid-of-the-dark-the-surprising-link-between-light-pollution>