nlighten me.""The Immortal and the Perfect."Li Chen said faintly, "People will die eventually. Some deaths are heavier than Mount Tai, and some lighter than a feather, but there is no immortal in the...you are, you'll die. Therefore, if we're talking about value, air is the most precious thing."But just because air is everywhere, filling the heaven and earth, no one would pay money to breathe it. Th...