Wikipedia lays out David Premack’s principle in laymen’s terms: Premack's Principle suggests that if a student wants to perform a given activity, the student will perform a less desirable activity to get at the more desirable activity. Many people grow up under a rigorous application of the principle. Parents around the world tell kids to “finish your homework before you play outside”, and “finish your vegetables* before you eat desert”. Did you ever wonder if the “no pain, no gain” line of thought drilled into us since grade...