If you talk to someone who knows food but not science, it won't be long before some jab at Monsanto issues forth. And if you persist in discussing biology, it really won't be long before you get called a shill for Monsanto.

You don't have to use biology, you could also do the same social experiment using energy or medicine, if your test is for left-wing people, or global warming, if you want to see the right go into a tirade about science. 

You know what happens to women when they watch Katherine Heigl movies or episodes of "The Bachelor"? 

Well, it happens to men also - when they think there might be beer nearby.

Really, it is almost Pavlovian, except the saliva is mental too. A PET scan study found that even when no alcohol was involved, the flavor of beer caused striatal dopamine release in men.(1) 

The striatum in men (and women - and all primates - but this particular study is about men, so, let's stay on message) consists of the caudate nucleus and the putamen and it gets input from the cerebral cortex and structures like the amygdala and hippocampus.

When most people think 'green' in America, they think of liberal Democrats. It's a carefully crafted image. Conservatives who deny global warming conserve energy just as much as liberals who accept it but that gets little attention. Sociologists in a new paper instead found that the idea of the 'green' Christian is the environmental trope they need to spend their time debunking.