I agree with you, certainty is a confusing term to a lot of people, and your article goes a long way to clearing some of the confusion. However, it seems to me that there are some things of which man can be 100% certain. They are:
1. No man has the right to initiate physical and/or mental force against another. Retaliation is permitted only against those who are initiating physical and/or mental force against you.
1. Man is a being of volitional consciousness.
2. Manís innate right is to have the right to his own life.
3. Reality is that which exists.
1. Reason is manís only absolute.
When you consider the concept of certainty in this manner, then you stop those who would argue in favor of uncertainty in their tracks. They can argue that all of the rest of our knowledge represents a degree of certainty, and at any given time newly discovered evidence can alter the nature of mansí knowledge. But they canít argue that there is no possibility of man possessing at least some knowledge that is 100% certain.