Not to worry about hydrogen, Alex. A fuel cell based on methane--already available as natural gas--would do the trick and we already have a distribution network in place. I believe some materials such as activated carbon and perhaps carbon nanotubes readily absorb methane, so need for high-pressure storage tanks or cryogenic delivery of liquid hydrogen. Flue cerlls run hot, though, so we still must content with high temps, which can limit use in vehicles.
Linear guides are one of the most important components required for the design of automated or computer-controlled equipment. Aluminum profile extrusions, used for these guides, can enable designed-in functional features.
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