A longitudinal study of the School Sisters of Notre Dame in the US, has discovered surprising insights into the impact speaking many languages has on a person's likelihood of developing dementia. The ground-breaking Nun Study has been studied since the 1980's and is now a complete, data rich cohort of more than 600 nuns. Public health professor at Waterloo University in Canada, Professor Suzanne Tyas, has studied the nun's brains and drawn fascinating conclusions from those who spoke multiple languages.
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