Well you know about all those fancy battery technologies you’ve seen in the news? Some of those are already 30 years old by now and they are still stuck in the lab whereas Li-ion actually became a product. There has got to be a good reason why that happened. Maybe the technology was too expensive, too fragile, or maybe there was another drawback the article never mentioned. Same kinds of challenges face superconductors, graphene and fusion. That’s why we have these headlines periodically.