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01:30
What causes kidney stones? | #aumsum
57
B2 High-Intermediate
US
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00:51
Why do koalas hug trees? | #aumsum
56
B2 High-Intermediate
US
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01:04
What causes Sinkholes? | #aumsum
55
B2 High-Intermediate
US
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01:04
What is sleep paralysis? | #aumsum
53
B1 Intermediate
US
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01:09
Why do we bite our nails? | #aumsum
49
B1 Intermediate
US
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01:02
How do fireflies glow? | #aumsum
48
B2 High-Intermediate
US
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01:00
Caffeine - How does coffee keep you awake? | #aumsum
48
B2 High-Intermediate
US
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00:54
Why are flamingos pink? | #aumsum
46
B2 High-Intermediate
US
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01:06
Can jellyfish live forever? | #aumsum
46
C2 Advanced
US
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01:31
What if we stopped drinking water? | #aumsum
45
B2 High-Intermediate
US
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01:35
Osmosis - How do fish drink water? | #aumsum
44
A2 Basic
US
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00:56
Lateral Inversion - Why is ambulance written in…
42
B2 High-Intermediate
US
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