You can’t say A is made of B or vice versa. All mass is interaction.

When you get as old as I am, you start to realize that you've told most of the good stuff you know to other people anyway.

To decide upon the answer is not scientific. In order to make progress, one must leave the door to the unknown ajar ajar only.

There is no authority who decides what is a good idea.

We never are definitely right, we can only be sure we are wrong.

To guess what to keep and what to throw away takes considerable skill. Actually it is probably merely a matter of luck, but it looks as if it takes considerable skill.

In physics the truth is rarely perfectly clear, and that is certainly universally the case in human affairs. Hence, what is not surrounded by uncertainty cannot be the truth.