Best Invention

My father thought that either penicillin or lightbulbs were the most important inventions contributing to our modern society. He thought that lightbulbs were quite important because they increased our efficiency after or before exponentially and let us have longer days.  Penicillin gave us the ability to overcome what now seems like minimal diseases and eventually eradicate multiple of them. Overall, both of these things were revolutionary developments that increased our population and working time. These type of developments are the ones that truly let us progress as a whole.