Yes, if I may, I can start with this. The infrastructure has a few technical issues on production and distribution that we have to tackle. There are many ways to generate hydrogen, which are in general known, but you really have to perfect these so they work for regular customers. With our cars being out there in California or Germany, for instance, we have the issue that customers cannot fill the car because a station is down. There is a station, but the station is down because of technical issues. That's one part where we need more research and more work going into it.
The other one, of course—