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04:57 Science & Technology The mysterious origins of life on Earth Lesson duration 04:57 Manage Library 1,149,132 Views
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04:20 Social Studies The Romans flooded the Colosseum for sea battles Lesson duration 04:20 Manage Library 895,104 Views
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04:33 Environmental Science What's the difference between weather and climate? Lesson duration 04:33 Manage Library 3,178,981 Views
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05:19 Science & Technology Are we running out of clean water? Lesson duration 05:19 Manage Library 913,075 Views
05:21 Science & Technology What’s the smallest thing in the universe? Lesson duration 05:21 Manage Library 1,226,396 Views
04:35 Science & Technology Is fire a solid, a liquid, or a gas? Lesson duration 04:35 Manage Library 2,476,342 Views
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05:22 Science & Technology What would happen if every human suddenly disappeared? Lesson duration 05:22 Manage Library 4,965,313 Views
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05:32 Social Studies How one scientist averted a national health crisis Lesson duration 05:32 Manage Library 1,902,904 Views
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09:03 Science & Technology Are GMOs good or bad? Lesson duration 09:03 Manage Library 13,413,380 Views