I question everything I'm told, at once.
Then I question myself.
usually I disagree with what I have to say about it and so argue with myself until I pass out. This repeats more or less constantly.
No matter the amount of information I gather on a subject I question my own conclusion, and seek its faults and then question them as well. The information is always biased, and it is always lacking. I "inform" myself until I think I have a relatively clear picture of what is going on, based on my own faulty conclusions and failing memory, and end up with a probability that seems likely to me but one which cannot usefully be viewed as fact/truth and thus must always be revised.
Ask and observe, question and revise, until your eyes bleed and your brain is on fire. Then continue forever with this.