Fist-sized 11M-to-1 gearbox
Will this also work as a 1 to 11M gearbox?  If so it might allow a strong force (e.g. the weight of a large body of water) to spin a small electric generator.  That will allow small scale hydroelectric storage for renewable sources.<p>If not it can probably still find some applications for turning something like weak wind power into something that can create great pressure.