Both for my wife and myself, the personal friendships that have grown out of scientific contacts with colleagues from many different countries have been an important part of our lives, and the travels we have made together in connection with the world-wide scientific co-operation have given us rich treasures of experiences.

I have been connected with the Niels Bohr Institute since the completion of my university studies, first as a research fellow and, from 1956, as a professor of physics at the University of Copenhagen. After the death of my father in 1962, I followed him as director of the Institute until 1970.

Like the protagonist of her 2006 novel, 'Love and Other Impossible Pursuits,' Ayelet Waldman is a Jewish redhead who attended Harvard Law School and is madly in love with her husband. But the obvious similarities end there.

Marriage is a great institution.

I'm getting my psychology degree with a focus on marriage and family therapy.

Little children are still the symbol of the eternal marriage between love and duty.