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01:00
Caffeine - How does coffee keep you awake? | #aumsum
69
B2 High-Intermediate
US
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01:02
Why is the ocean blue? | #aumsum
30
B1 Intermediate
US
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00:55
Earthing - Why do buildings have lightning rods?…
27
B1 Intermediate
US
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01:10
Is Antibacterial soap bad for you? | #aumsum
11
B2 High-Intermediate
US
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01:25
Why don't we drink seawater? | #aumsum
8
B1 Intermediate
US
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00:58
Why dont spiders stick to their webs? | #aumsum
95
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
362
B2 High-Intermediate
US
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01:33
What causes chapped lips? | #aumsum
27
B1 Intermediate
US
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01:37
Why do we sweat? | #aumsum
170
B1 Intermediate
US
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02:35
Why is ultrasound used in sonar? | #aumsum
24
A2 Basic
US
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01:22
Why are sunsets red? | #aumsum
20
B2 High-Intermediate
US
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