Over 120 Aboriginal communities run their own health services - some have been doing so for 30 years. They struggle with difficult medical problems. They also try to deal with counselling, stolen generations issues, family relationships, violence, suicide prevention.

Because I am not formally trained in the medical sciences, I can bring in new ideas to AIDS research and the cross-fertilization of ideas from different fields could be a valuable contribution to finding the cure for AIDS.

If I'm pushed, I'd also have to admit I don't like people with allergies. They just annoy me. There seems to be something far too self-centred about it. 'No thanks, I'm allergic.' Why not just say 'No thanks'? I wasn't asking for your medical history, I was just passing around the nuts. Trying to be friendly, that's all.

Haiti is always talking about decentralization and nothing has been so obvious, perhaps a weakness, as the centralized nature of Haitian society as being revealed by the earthquake. I mean, they lost all these medical training programs because they didn't have them anywhere else.

The growth of technology is such that it is not possible today for a nuclear physicist to switch into medical physics without training. The field is now much more technical. More training is needed to do the job.