It is made from a blend of crushed rock, rubber and polyurethane, a synthetic plastic that replaces bitumen as the binding agent and allows even bigger pores in the road surface.

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The group infused a plastic-like polymer with microscopic capsules containing a liquid healing agent.

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At his office near Bellingham, Washington, Special Agent Paul Weyland of the US Fish and Wildlife Service pulls a large plastic bag out of a freezer.

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