Back in time to 100 BC, what knowledge would you impart to the people?
Todd: By 100BCE the Greek classical period had already passed and Rome was on the rise. A high level of culture existed in places and sophisticated thought was commonly expressed in written form.Metallurgy was sufficient. Many of the works of artisans and craftsmen haven't been duplicated. A great majority of this knowledge was lost to time (c.f., the fire of Alexandria) because copying texts was an enormous amount of work.Also, even if a great body of knowledge were imparted to people in that period, who's to say that it would be disseminated? The knowledge that went into the construction of the Antikythira mechanism--even the knowledge that such knowledge existed--was lost.So I would push up the invention of the printing press by 1.5 millenia.Even without imparting any additional knowledge, the sheer volume of written material that would have been passed down through the centuries would guarantee more rapid advancement of civilization, as well as preservation of history. We would have the works of Sappho, for example. And history would still progress naturally, without artificial interference.