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01:02
What makes tattoos permanent? | #aumsum
12
B2 High-Intermediate
US
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00:55
Earthing - Why do buildings have lightning rods?…
12
B1 Intermediate
US
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01:01
Why are auroras formed? | #aumsum
12
B1 Intermediate
US
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01:05
Why do we use a black umbrella in summer? | #aumsum
12
B1 Intermediate
US
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01:05
Why do we see only one side of the moon? | #aumsum
12
B2 High-Intermediate
US
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01:34
Why do we get pimples? | #aumsum
12
B2 High-Intermediate
US
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01:24
Why do woolen clothes keep us warm? | #aumsum
12
B1 Intermediate
US
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01:04
Why is fluoride added to water? | #aumsum
11
B1 Intermediate
US
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02:33
Why do we have two eyes instead of one? | #aumsum
11
B1 Intermediate
US
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00:50
What is Earwax? | #aumsum
11
B1 Intermediate
US
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01:07
Why do heavier objects fall faster? | #aumsum
11
B1 Intermediate
US
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01:51
Friction - Why is it difficult to pull a boat…
11
B1 Intermediate
US
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