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01:01
Pathogens - Why do we get fever? | #aumsum
39
B2 High-Intermediate
US
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01:25
How do bees make honey? | #aumsum
42
B2 High-Intermediate
US
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01:00
What are tonsil stones? | #aumsum
14
B2 High-Intermediate
US
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01:25
Why do we get dandruff? | #aumsum
22
B2 High-Intermediate
US
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01:34
Why do we get pimples? | #aumsum
12
B2 High-Intermediate
US
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01:03
What is an allergy? | #aumsum
38
B2 High-Intermediate
US
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01:51
Friction - Why is it difficult to pull a boat…
11
B1 Intermediate
US
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01:01
Water Purification - Why is alum added to water?…
23
B1 Intermediate
US
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00:58
Why do people grind their teeth? | #aumsum
11
B2 High-Intermediate
US
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01:23
Why is blood red in color? | #aumsum
17
B1 Intermediate
US
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01:24
Why do woolen clothes keep us warm? | #aumsum
12
B1 Intermediate
US
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01:34
How do vaccines work? | #aumsum
118
B1 Intermediate
US
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