What percentage of your knowledge are you absolutely sure of?
What are your criterias in evaluating the reliability of the information?
How do you know that the information is not biased?
Do you know which piece of information in your brain comes from gossip, false assumption, TV show fiction, unchecked fact from a magazine, an opinion from a blog or a well-documented piece of reliable knowledge?
Can you differenciate between accurate memories and false/distorted memories from 20 years ago?
How do you know that even a well-documented information from a reliable source is not false?