Comment on Know the Difference by KylieKattu
Even if they are testing spa products, not for harmful side effects but to see how good they are, how shiny they make your hair, how good they are at getting out chewing gum, etc.? Or like Pavlov who rang a bell every time he fed his dog and then started ringing it before he gave it the food and found that his dog drooled before the food even came out when he heard the bell?
