Thanks for bringing up the subject of Oliver Sacks, Helen. I saw him this week in a very interesting programme (US, I think) about a man who had an operation to restore his sight, giving scientists an opportunity to comunicate with a highly articulate patient with the sight of a three year old in order to study the science of preception. I felt very sorry for the man involved but was glad that he was so willing to involve himself in experiements that could eventually benefit others.

Oliver Sacks also wrote the book which wins the award for my favourite title:
http://www.oliversacks.com/hat.html