Building a good argument.
Do you ever read a headline like Processed Meat Causes Cancer!! If you believe everything you read, life is scary.
The truth is sometimes different. Observable science says you are 6/1000 more likely to get cancer if you eat lots and lots of processed meat. Not exactly the sure thing our original headline states.
We have to be careful what we believe. This is an age of easy to find facts, but not reason. That is where math comes into the picture.