I was perfectly prepared to accept that cave diving is a fabulously risky sport (I have jumped in darkness into metres deep cave pools in Waitomo, and even in such a supervised setting the danger was obvious).
However, I was surprised to see cheerleading listed as dangerous: I thought the greatest danger was that of slights and snubs from peers. There are counter arguments, Claire Bennet found it a dangerous sport.
But to return to more serious matters I think the top pick from the Cavalcade was justly Jason Shafrin's consideration of the links between complexity and income for doctors. This has echoes in financial advice - really complex financial advice doesn't seem to pay quite as well (on average) as fairly complex advice given on a broader scale. But returns drop once again as you enter the territory of simpler advice - as this is delivered very effectively by large businesses enjoying economies of scale.