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20
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01:07
What causes cavities? | #aumsum
346
B2 High-Intermediate
US
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01:14
Why do we breathe through one nostril? | #aumsum
194
B2 High-Intermediate
US
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01:37
Why do we sweat? | #aumsum
151
B1 Intermediate
US
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01:34
How do vaccines work? | #aumsum
118
B1 Intermediate
US
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02:26
Modes of Transportation | Videos for Kids | #aumsum
93
A2 Basic
US
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01:06
Why do we yawn? | #aumsum
88
B1 Intermediate
US
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00:58
Why dont spiders stick to their webs? | #aumsum
81
B1 Intermediate
US
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01:22
Why can't you use phones on planes? | #aumsum
75
B1 Intermediate
US
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01:01
What causes earthquakes? | #aumsum
75
B1 Intermediate
US
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01:06
Why does ice float? | #aumsum
69
B2 High-Intermediate
US
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01:04
Why do we get angry when we are hungry? | #aumsum
64
B2 High-Intermediate
US
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01:06
How do glasses work? | #aumsum
57
B2 High-Intermediate
US
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