it is good to have measured myself, to recognize my limitations.

There is nothing more beautiful than cheerfulness in an old face, and among country people it is always a sign of a well-regulated life.

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

The most remarkable feature about the magnitude scale was that it worked at all and that it could be extended on a worldwide basis. It was originally envisaged as a rather rough-and-ready procedure by which we could grade earthquakes. We would have been happy if we could have assigned just three categories, large, medium, and small; the point is, we wanted to avoid personal judgments. It actually turned out to be quite a finely tuned scale.

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

it is good to have measured myself, to recognize my limitations.

Spring makes everything young again except man.