Hydrogen is not particularly efficient however either and while it may have its place, better options for now appear to be using cooling and heating as energy stores (think refrigeration plants, swimming pools, etc.).
Another interesting option will be the ability to use plug-in hybrids as an energy store. If there is a high uptake of plug-in hybrids, they could make a real difference for uptake of renewables. A real win-win.
Do you refer to the efficiency of fuel cells (which are made of not so eco friendly elements)? How about using hydrogen in combustion engines (like the BMW 7H), is efficiency higher?
The problem with hybrids in general are batteries, which are improving a lot, but still are not perfect. As the owner of a Prius I know how much these things are far from ideal.
Regarding the problem of energy sources which produce a variable amount of energy during the day (Tom mentions wind which I think is a good example), could hydrogen be a good way of storing that energy for later use? Shouldn't be easier to store hydrogen
in pressure vessels than electric energy in aging batteries? Just a thought.
MacOS does use dlls or sos. It gives the appearance that they don't exist because the application you are clicking on is actually a directory with an extension of .app. Everything the application depends on is in the directory so when
you drag it around places, everything goes with it. As for shared dlls, they are stored in the library directory. The application contains a manifest that tells it which libraries it relies on. Its all very simple.
Well, it does not look substantially different from Windows...