Logic Doesn't Apply To The Real World.

It Makes No Sense To Seek A Single Best Way To Represent Knowledge-because Each Particular Form Of Expression Also Brings Its Particular Limitations. For Example, Logic-based Systems Are Very Precise, But They Make It Hard To Do Reasoning With Analogies. Similarly, Statistical Systems Are Useful For Making Predictions, But Do Not Serve Well To Represent The Reasons Why Those Predictions Are Sometimes Correct.

Artificial Intelligence Is The Science Of Making Machines Do Things That Would Require Intelligence If Done By Men.

No Computer Has Ever Been Designed That Is Ever Aware Of What It's Doing; But Most Of The Time, We Aren't Either.

Societies Need Rules That Make No Sense For Individuals. For Example, It Makes No Difference Whether A Single Car Drives On The Left Or On The Right. But It Makes All The Difference When There Are Many Cars!

Each Practitioner Thinks There's One Magic Way To Get A Machine To Be Smart, And So They're All Wasting Their Time In A Sense. On The Other Hand, Each Of Them Is Improving Some Particular Method, So Maybe Someday In The Near Future, Or Maybe It's Two Generations Away, Someone Else Will Come Around And Say, "let's Put All These Together," And Then It Will Be Smart.