If you were teleported to ancient Greece, 400 BC, what modern technology would you be able to recreate?

I can make a stab at gunpowder, the printing press, and the Bessemer process. Edit: I forgot penicillin. There are plenty of other things I can give some tips or sort of the basics on, but I'd probably have to wait to get established to move forward. A critical mass might get enough apprentices or talent to work from ideas and the basis of it (photography, electricity generation, internal combustion engine, mechanical clocks that work on ships as well as the knowledge of how to use clocks for navigation).