Surgeons: At the edge of life.
Absolutely bloody fascinating and the surgeons I've seen so far come across as very human rather than arrogant.
I watched one where a woman had a 25cm section of her aorta replaced and it was incredibly intense viewing as her body cavity filled with blood and it was spurting everywhere and yet they carried on, calm, decisive and effective. I can't even imagine how intense it must be to actually be involved in these operations.
Watching what they do and the level of technology that has been developed to allow these procedures to happen leaves me with a great sense of how absolutely amazing human beings can be.