Which is trickier – brain surgery or heart surgery?

Readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific concepts
  
  

Surgeons at work … what's the toughest job? Photograph: Thierry Dosogne/Getty Images
Surgeons at work … what's the toughest job? Photograph: Thierry Dosogne/Getty Images Photograph: Thierry Dosogne/Getty Images

Which is trickier, brain surgery or heart surgery? Or is there another surgery that’s harder than both?

Sandra Johnson, Manchester

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