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05:28
Electrolytic Refining of Metals | #aumsum
6
B2 High-Intermediate
US
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03:11
Soil Formation for Kids | #aumsum
13
B1 Intermediate
US
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01:05
How do dolphins sleep? | #aumsum
38
B2 High-Intermediate
US
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06:38
Simple Distillation | #aumsum
14
B2 High-Intermediate
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01:07
How do X-rays work? |Why is Space Black? | #aumsum
15
B1 Intermediate
US
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05:07
Why do mosquitoes bite only some people? plus…
14
B2 High-Intermediate
US
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01:04
Why is fluoride added to water? | #aumsum
11
B1 Intermediate
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01:37
Why do we sweat? | #aumsum
151
B1 Intermediate
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05:41
Balanced Diet | #aumsum
63
B2 High-Intermediate
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05:46
Why are Fish eating Plastic? | #aumsum
34
B1 Intermediate
US
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05:53
Photosynthesis | #aumsum
17
B2 High-Intermediate
US
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01:10
What is a Tsunami? | #aumsum
22
B2 High-Intermediate
US
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