Humans needed water or they would die, but dirty water killed as surely as thirst. You had to boil it before you drank it. This culture around tea was a way of tiptoeing along the knife edge between those two ways of dying.
Neal StephensonJust as an informal, nonscientific observation, most people's personalities don't seem to change very much during their lives. There are exceptions in the case of people who go through hugely traumatic events or suffer from brain injury or disease. Some would argue that religious conversions can have deep personality-altering effects. But these are all exceptions to the rule.
Neal StephensonIt is commonly the case with technologies that you can get the best insight about how they work by watching them fail.
Neal StephensonAres always reemerges from the chaos. It will never go away. Athenian civilization defends itself from the forces of Ares with metis, or technology. Technology is built on science. Science is like the alchemists' uroburos, continually eating its own tail. The process of science doesn't work unless young scientists have the freedom to attack and tear down old dogmas, to engage in an ongoing Titanomachia. Science flourishes where art and free speech flourish.
Neal Stephenson