Think about the last time you shopped for groceries. If you’re not a vegetarian, how much did you think about buying meat? “A little?” “None?” Were you even paying attention? Thank Upton Sinclair. Well, thank the FDA, for which you can thank Theodore Roosevelt, for whom you can thank Sinclair’s 1906 exposé The Jungle—and his letter to Roosevelt. As long as everyone’s playing by the rules, there are no, uh, people these days in your burger. Wasn’t always this way. Workers falling into machines, cows playing Go Fish, sheep hanging from the fan, lazy chickens…