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03:12 Psychology How is your phone changing you? Lesson duration 03:12 Manage Library 5,369,811 Views
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05:15 Social Studies The rise of the Ottoman Empire Lesson duration 05:15 Manage Library 1,343,859 Views
05:47 Science & Technology Who decides how long a second is? Lesson duration 05:47 Manage Library 2,290,078 Views
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18:12 Health For parents, happiness is a very high bar - Jennifer Senior Lesson duration 18:12 Manage Library 298,165 Views
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05:38 The strange history of the world's most stolen painting Lesson duration 05:38 Manage Library 826,740 Views