Russian roulette

As investing author William Bernstein points out, “That is also how often you win at Russian roulette.”

Deep sea explorer Victor Vescovo said he had grave misgivings about Titan and that he had told people that diving in the sub was like playing Russian roulette.

"It's like playing Russian roulette and getting the bullet."

That creates what Mr Willison describes as an "immunological Russian roulette", triggering an "acute neurological tsunami" that surges through the peripheral nervous system.

"We're playing a bit of a Russian roulette game," warns Prof England.