We've all laughed at the Vidal Sassoon commercials showing the caged monkeys having shampoo shoved into their eyes with Q-tips, but did you know that those monkeys never got paid for that commercial? So, I know that they test hair-care products and certain vaccines on animals. But, what about anti-depressants. How do you know if an animal is depressed or not, or schizophrenic? And then judging whether or not they got better?