In the 3000 BC scenario, there is no technology possessed by all four starting civs, so you can't really disable plagues (at least not without modifying their starting techs). Agriculture, however, is possessed by three (Egypt, China, and Babylon). Only two start with mining. Why, then, does the advice for disabling plagues say to change iMedicine to iMining? Wouldn't changing it to iAgriculture make more sense?