Someone needs to create a mass produced medical device that explains pressure on bones. It shows a replica leg and knee and when you place a certain amount of pressure on top (by a toggle or a lever, or by having a small kid sit on it, i dont know) some of the parts go from clear, to yellow, to red. Then send it out to all the doctors so they can explain obesity and the effects on joints.  And I just wasted my unique idea of the day.