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04:28
What causes Heartburn? | #aumsum
51
B2 High-Intermediate
US
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07:17
The Human Heart | #aumsum
34
B2 High-Intermediate
US
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01:06
Why does ice float? | #aumsum
69
B2 High-Intermediate
US
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01:09
Why do we bite our nails? | #aumsum
50
B1 Intermediate
US
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01:06
Why do we yawn? | #aumsum
90
B1 Intermediate
US
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01:04
Why do we get angry when we are hungry? | #aumsum
73
B2 High-Intermediate
US
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00:56
Lateral Inversion - Why is ambulance written in…
46
B2 High-Intermediate
US
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16:19
Why do papers turn yellow? plus 9 more videos..…
14
B1 Intermediate
US
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01:14
Why do we breathe through one nostril? | #aumsum
200
B2 High-Intermediate
US
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01:10
Is distilled water safe to drink? | #aumsum
27
B2 High-Intermediate
US
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01:36
Why does spicy food make your nose run? | #aumsum
25
B1 Intermediate
US
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01:17
Why do we get sunburn? | #aumsum
28
B2 High-Intermediate
US
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