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A member of staff poses for a photograph with the artwork "Migraine", by Jake and Dinos Chapman, at Sotheby's auction house in London March 4, 2015. The work is part of an eclectic exhibition and sale called Bear Witness, which will be auctioned over three days from March 10.

Paul Hackett/Reuters

A member of staff holds the artwork Migraine, by Jake and Dinos Chapman, at Sotheby’s auction house in London on Wednesday. The work is part of an exhibition and sale called Bear Witness, which will be auctioned over three days next week

A demonstrator marches during a teachers protest demanding better working conditions and against police beating, on Monday night in Rio de Janeiro.

Christophe Simon/AFP

A demonstrator marches during a teachers protest demanding better working conditions and against police beating, late on Monday night in Rio de Janeiro.