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01:05
Why do we use a black umbrella in summer? | #aumsum
13
B1 Intermediate
US
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01:10
What is a Tsunami? | #aumsum
28
B2 High-Intermediate
US
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01:01
Gravity - Why are planets spherical? | #aumsum
26
B1 Intermediate
US
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01:28
What causes dark circles? | #aumsum
18
B1 Intermediate
US
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00:57
Can you solve this Riddle? | #aumsum
16
B1 Intermediate
US
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00:59
How do straws work? | #aumsum
9
B1 Intermediate
US
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02:00
Why is oxalic acid used to remove rust stains?…
26
B1 Intermediate
US
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01:01
What causes earthquakes? | #aumsum
80
B1 Intermediate
US
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01:39
Human Tears - Why do onions make you cry? | #aumsum
19
B2 High-Intermediate
US
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01:06
How do pain relievers work? | #aumsum
8
B1 Intermediate
US
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00:56
Why is dry ice so dangerous? | #aumsum
9
B1 Intermediate
US
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01:05
Why do we see only one side of the moon? | #aumsum
13
B2 High-Intermediate
US
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