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05:22 Science & Technology What would happen if every human suddenly disappeared? Lesson duration 05:22 Manage Library 4,961,681 Views
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05:06 Health Why does your voice change as you get older? Lesson duration 05:06 Manage Library 1,711,506 Views
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05:10 Science & Technology Why don’t poisonous animals poison themselves? Lesson duration 05:10 Manage Library 2,527,606 Views
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04:49 Science & Technology How does hibernation work? Lesson duration 04:49 Manage Library 1,514,414 Views
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