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05:17 Geometry How many ways are there to prove the Pythagorean theorem? Lesson duration 05:17 Manage Library 3,619,320 Views
06:04 Environmental Science The life cycle of a t-shirt Lesson duration 06:04 Manage Library 2,996,757 Views
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06:26 History The rise and fall of the Berlin Wall Lesson duration 06:26 Manage Library 8,941,312 Views
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