Everyone knows it takes a woman nine months to have a baby. But you Americans think if you get nine women pregnant, you can have a baby in a month.

I am quite pessimistic about ever achieving interstellar travel.

A scientist describes what is. An engineer creates what never was.

Scientists study the world as it is, engineers create the world that never has been.

I came to realize that exaggerated concern about what others are doing can be foolish. It can paralyze effort, and stifle a good idea. One finds that in the history of science, almost every problem has been worked out by someone else. This should not discourage anyone from pursuing his own path.

Everyone knows it takes a woman nine months to have a baby. But you Americans think if you get nine women pregnant, you can have a baby in a month.

Science is the study of what Is, Engineering builds what Will Be. The scientist merely explores that which exists, while the engineer creates what has never existed before.