Is it possible to identify real chemistry in  a photograph?

Four of these vintage screen couples were lovers in real life. See if you can guess which ones?

Clark Gable and Joan Crawford in ‘Possession’.

Leslie Howard and Myrna Loy in ‘Animal Kingdom’.

Marlene Dietrich and Garry Cooper in ‘Desire’.

Robert Taylor and Greta Garbo in ‘Camille’.

Tyrone Power and Loretta Young in ‘Three Ladies In Love’.

‘Clark Gable and Loretta Young ‘Call Of The Wild’.

Garry Cooper and Barbara Stanwyck in ‘Meet John Doe’.

Humphrey Bogart and Lauren Bacall in ‘To Have And Have Not’

Vivienne Leigh and Robert Taylor in ‘Waterloo Bridge’.

Spencer Tracey and Katherine Hepburn in ‘Pat and Mike’.

Bette Davis and George Brent in ‘Dark Victory’.

Greta Garbo and John Gilbert in ‘Queen Christina’.