<http://schema.org/alternativeHeadline>
"Researchers vacuumed the clothing and baggage of nearly 1,000 volunteers who had traveled to Antarctica to get a sense of the invasive species."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/wilderness-resources/stories/antarctica-being-invaded-by-alien-plant-species>