<http://schema.org/about>
"\nFree-Piston Engines: The Future?\nWhile we wait for battery and hypercapacitor breakthroughs to allow us to go 100% electric and ditch internal combustion engines, series plug-in hybrids (electric motors turn the wheels and a gas generator kicks in when"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/cars/super-efficient-free-piston-engines-could-replace-traditional-gas-and-diesel-engines.html>