So many people talk about guniea pigs as the research subject. I think this is a disservice for the pigs. Personally I think the Shaft Canary is a much better analogy. You see, the subtle changes from the human guinea pigs may not make big headlines or get the public to listen....But, the canary in the shaft always makes big press.
If you don't know what I am talking about, let me explain. One of coal miners earliest and continuous problems was carbon monoxide. It can kill fairly quickly. But way back when, there were no gas detectors.....we had a vey limited ability to identify the dangerous gas. So what did they do? They carried a surrogate into the mine...The canary was a pretty easy to read detector. If the bird died, then you should leave the mine shaft.