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00:58
Why dont spiders stick to their webs? | #aumsum
85
B1 Intermediate
US
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01:06
Can jellyfish live forever? | #aumsum
46
C2 Advanced
US
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01:07
What causes cavities? | #aumsum
353
B2 High-Intermediate
US
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01:33
What causes chapped lips? | #aumsum
26
B1 Intermediate
US
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05:45
Physical and Chemical Changes for Kids | #aumsum
33
B1 Intermediate
US
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05:42
Daltons Atomic Theory | #aumsum
12
B1 Intermediate
US
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04:11
Chromatography | #aumsum
30
B1 Intermediate
US
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01:37
Why do we sweat? | #aumsum
157
B1 Intermediate
US
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02:35
Why is ultrasound used in sonar? | #aumsum
17
A2 Basic
US
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07:57
Sexual Reproduction in Flowering Plants | #aumsum
15
B2 High-Intermediate
US
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03:46
Quadratic Equations | #aumsum
9
B1 Intermediate
US
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01:22
Why are sunsets red? | #aumsum
20
B2 High-Intermediate
US
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