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01:14
Why do we breathe through one nostril? | #aumsum
198
B2 High-Intermediate
US
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01:06
Why do we yawn? | #aumsum
90
B1 Intermediate
US
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01:00
Caffeine - How does coffee keep you awake? | #aumsum
53
B2 High-Intermediate
US
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01:34
How do vaccines work? | #aumsum
119
B1 Intermediate
US
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01:07
What causes cavities? | #aumsum
351
B2 High-Intermediate
US
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01:06
Why does ice float? | #aumsum
69
B2 High-Intermediate
US
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01:02
Why do we get car sickness? | #aumsum
42
B2 High-Intermediate
US
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01:06
Why do our teeth turn yellow? | #aumsum
20
B2 High-Intermediate
US
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01:22
Why can't you use phones on planes? | #aumsum
82
B1 Intermediate
US
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01:33
What causes chapped lips? | #aumsum
26
B1 Intermediate
US
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02:26
Modes of Transportation | Videos for Kids | #aumsum
97
A2 Basic
US
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01:05
Why do we use a black umbrella in summer? | #aumsum
13
B1 Intermediate
US
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