<http://schema.org/alternativeHeadline>
"LED-embedded solar paver lights are a dime a dozen. And then there's NightTec Leuchsteine paving stones from Germany in which the concrete itself glows once the sun goes down."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/your-home/at-home/blogs/light-recycling-pavers-save-energy-prevent-stumbling-around-in-the-dark>