<http://schema.org/alternativeHeadline>
"Compact fluorescent lamps are more efficient than traditional light bulbs, but they also contain toxic mercury. MNN sheds light on which is the brighter pick."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/earth-matters/translating-uncle-sam/stories/cfl-vs-incandescent-battle-of-the-bulb>