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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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04:24
What if we Stopped eating Sugar? | #aumsum
192
B2 High-Intermediate
US
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01:37
Why do we sweat? | #aumsum
151
B1 Intermediate
US
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24:46
Which Came First : Chicken or Egg? | #aumsum
146
B1 Intermediate
US
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26:14
How do some Insects Walk on Water? | #aumsum
119
B2 High-Intermediate
US
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01:34
How do vaccines work? | #aumsum
118
B1 Intermediate
US
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24:13
How do Miracle Fruits work? | #aumsum
117
B1 Intermediate
US
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06:50
How much Water should you Drink per day? | #aumsum
110
B1 Intermediate
US
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49:23
Why does the sky appear blue? plus 10 more videos..…
99
B2 High-Intermediate
US
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05:04
What if all Insects Disappeared? | #aumsum
95
B1 Intermediate
US
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02:26
Modes of Transportation | Videos for Kids | #aumsum
93
A2 Basic
US
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