There's a lot of holes in this article. They made a one millimeter thick sheet of organic matter transparent by bleaching it and then filling it with clear epoxy. None of that indicates a utility for building materials. You could do that to almost anything organic, from a sheet of intestinal lining to a seaweed nori roll. To beat glass and plastic it has to scale. Call me jaded but I think if these guys could produce a transparent 2x4 they'd have shown it off.