What would the world be like if scientists suddenly predicted with 100% certainty....?

there would be no order. Mans role in society is to persue his happiness while complying with the demands of his society to ensure the exsistance of that society. If man realizes his happiness will not be met with in the demands of the society, he will leave his society. My guess is you would see alot of self destructive behavior. Lots of , drugs, murder, theft. Everyone would be racing to have everything they ever wanted.