<http://schema.org/mainEntityOfPage>
<http://www.popularmechanics.com/science/green-tech/a6040/will-led-light-bulbs-best-cfls-and-incandescents/True>
<http://www.popularmechanics.com/science/green-tech/a6040/will-led-light-bulbs-best-cfls-and-incandescents/>