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The report, A Marked Improvement?, by the University of Oxford and the charity, Education Endowment Foundation (EEF), says there needs to be more research into which marking strategies really work, but it also identifies some approaches that do make a difference.
She said: 'I was particularly interested in a chemical in the brain called endorphin. Endorphins are part of our pain and pleasure circuitry – they’re our body's natural painkillers and also give us feelings of pleasure. Previous studies have suggested that endorphins promote social bonding in