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On the other hand, on the morning of the day we met, Gibson had prospected a nugget out of the newspaper: that the actor Eddie Marsan has situs inversus, a condition in which the positions of major internal organs are flipped into the opposite side of the body.

It also could be important for understanding why approximately 1 in 10,000 people are born with situs inversus, a condition where their internal organs are flipped like a lefty snail’s shell.

An earlier version of this article misstated the number of people who have the condition known as situs inversus.

She had situs inversus with levocardia, which means her liver, stomach and other abdominal organs were reversed right to left - the mirror image of a typical human anatomy.

Situs inversus with levocardia is rare, occurring about once in every 22,000 births.