However pragmatic you are, it is very demanding being a new parent.

There needs to be clearer communication for the public avout how valuable it [animal testing] is

I'm a traditional Jew with an orthodox background, and it informs much of my approach to science. Of course I think it's very important that if you have those sorts of backgrounds you don't impose them on other people as a clinician, of course.

Both in Britain and America, huge publicity has been given to stem cells, particularly embryonic stem cells, and the potential they offer. Of course, the study of stem cells is one of the most exciting areas in biology, but I think it is unlikely that embryonic stem cells are likely to be useful in healthcare for a long time.

Over the past 20 years, I have presented many science programmes on BBC1. But none is, I think, more socially important, or of more human interest, than this ongoing series of 'Child of Our Time.'

Ethics is not routinely taught to science students except in medicine, and I think it should be.

You can now modify the genes of large animals, and the largest animal we are concerned with is the human.