If one introduces the concept of energy of an earthquake then that is a theoretically derived quantity.

The rose does not bloom without thorns. True, but would that the thorns did not outlive the rose.

Spring makes everything young again except man.

My main point today is that usually one gets what one expects, but very rarely in the way one expected it.

Refining is inevitable in science when you have made measurements of a phenomenon for a long period of time.

In every area of the world where there is earthquake risk, there are still many buildings of this type; it is very frustrating to try to get rid of them.

I have a sense of humor; but over the years that sense has developed one blind spot. I can no longer laugh at ignorance or stupidity. Those are our chief enemies, and it is dangerous to make fun of them.