<http://schema.org/alternativeHeadline>
"?v=0gMCZFHv9v8 Now that 3D printing is mainstream enough to support high-street shops, facilities at Staples and plenty of cheap printers, researchers have turned their eye to the next stage: 4D printing.\u00A0The fourth dimension is time:\u00A0Scientists at Harvard, Pittsburgh and Illinois are developing materials that will \"exhibit behavior that changes over time.\" At the most basic...."^^<http://www.w3.org/2001/XMLSchema#string>
<http://qz.com/130253/3d-printing-is-becoming-4d-with-shape-shifting-objects/>