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00:56
How do fish breathe underwater? | #aumsum
10
B1 Intermediate
US
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00:51
Convex Lens - Can a magnifying glass burn paper?…
13
B2 High-Intermediate
US
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01:01
What is a Cataract? | #aumsum
17
B2 High-Intermediate
US
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01:02
Why is the ocean blue? | #aumsum
18
B1 Intermediate
US
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00:58
Why dont spiders stick to their webs? | #aumsum
81
B1 Intermediate
US
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01:22
Why are sunsets red? | #aumsum
19
B2 High-Intermediate
US
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02:48
Water Pollution for Kids | #aumsum
29
B2 High-Intermediate
US
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01:30
What causes kidney stones? | #aumsum
56
B2 High-Intermediate
US
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01:01
What is a stroke? | #aumsum
19
B1 Intermediate
US
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01:04
What is a mirage? | #aumsum
9
B1 Intermediate
US
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01:29
What is asthma? | #aumsum
17
B2 High-Intermediate
US
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01:28
What causes dark circles? | #aumsum
13
B1 Intermediate
US
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