"I am very much tempted, provided you can bring me back without further ado and I'm not overwhelmingly likely to be shot full of lightning bolts. It sounds like you have a lot of low-hanging fruit on the improving things angle. I'm not personally in a position to effectively bring you all the useful ramifications of, for example, germ theory - I know the general idea behind inoculation, for instance, but not well enough to set up an immunization clinic. But I would happily cruise around looking for obvious bad ideas."