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05:14
What if earth lost Oxygen for 5 seconds? | #aumsum
45
B1 Intermediate
US
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07:17
The Human Heart | #aumsum
33
B2 High-Intermediate
US
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08:06
3 Types of Rocks | #aumsum
37
B2 High-Intermediate
US
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06:04
Magnetism for Kids | #aumsum
8
B2 High-Intermediate
US
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07:25
Basic Subtraction for Kids | #aumsum
14
B2 High-Intermediate
US
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05:28
Electrolytic Refining of Metals | #aumsum
6
B2 High-Intermediate
US
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06:38
Simple Distillation | #aumsum
14
B2 High-Intermediate
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05:07
Why do mosquitoes bite only some people? plus…
14
B2 High-Intermediate
US
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05:41
Balanced Diet | #aumsum
63
B2 High-Intermediate
US
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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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05:50
Why is soil pH important to farmers? | #aumsum
7
B2 High-Intermediate
US
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