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01:00
Caffeine - How does coffee keep you awake? | #aumsum
48
B2 High-Intermediate
US
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01:02
Why is the ocean blue? | #aumsum
18
B1 Intermediate
US
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00:55
Earthing - Why do buildings have lightning rods?…
12
B1 Intermediate
US
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01:10
Is Antibacterial soap bad for you? | #aumsum
8
B2 High-Intermediate
US
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01:25
Why don't we drink seawater? | #aumsum
7
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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01:06
Can jellyfish live forever? | #aumsum
46
C2 Advanced
US
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01:07
What causes cavities? | #aumsum
346
B2 High-Intermediate
US
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01:33
What causes chapped lips? | #aumsum
25
B1 Intermediate
US
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01:37
Why do we sweat? | #aumsum
151
B1 Intermediate
US
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02:35
Why is ultrasound used in sonar? | #aumsum
13
A2 Basic
US
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01:22
Why are sunsets red? | #aumsum
19
B2 High-Intermediate
US
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