Scientists might invent a machine to scan ignorance.
Until then, you have to dispel it all by yourself.

The most unfortunate is the person who understands the importance of things after losing them. He scoffs at cancer or diabetes as if by birth he is permanently immune to any disease. This ignorance is understandable in illiterates or invalids; how do you explain this amongst educated tribes. Which is why, it becomes all the more important to remind everyone of the pain and suffering - sometimes with a serious intention to scare their tits off. These are the ads that reinforce the most effective concept of healthcare: "prevention is better than cure."