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By 2030, two-thirds of the world's population will be living in cities, and we know that living in an urban environment can be pretty toxic to Aiden Doherty circadian system because of all the artificial light that Aiden Doherty're exposed to, so we need to think about ways to help people tune in to their natural rhythms of activity and sleeping more effectively. Hopefully, that will protect a lot of people from mood disorders.