It Is Very Difficult To Make An

There Are Trivial Truths And The Great Truths. The Opposite Of A Trivial Truth Is Plainly False. The Opposite Of A Great Truth Is Also True.

Prediction Is Very Difficult, Especially If It's About The Future.

An Expert Is A Man Who Has Made All The Mistakes Which Can Be Made, In A Narrow Field.

It Is Difficult To Predict, Especially The Future.

A Physicist Visits A Colleague And Notices A Horseshoe Hanging On The Wall Above The Entrance. 'do You Really Believe That A Horseshoe Brings Luck?' He Asks. 'no,' Replies The Colleague, 'but I've Been Told That It Works Even If You Don't Believe In It.'