Mr. Tetro works in a university lab that does tests for hand sanitizers, including Purell.

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Last year, Coppola opened an Argentine subsidiary of his Zoetrope production company and has already begun filming an immigration drama called "Tetro" in Buenos Aires.

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It is true quats linger on the hands while alcohol evaporates in 10 or 20 seconds, says Jason Tetro, a microbiologist at the University of Ottawa in Ontario.

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The arrival of his long-lost younger brother, Benny (Alden Ehrenreich, a pale and determined young man reminiscent of Leonardo DiCaprio), conjures up the bad memories of earlier family life that caused Tetro to travel far and refuse contact.

NEWYORKER: Tetro