Spoken in 4 clips from 4 channels · C1 · other forms: optics
01 / 4Tom Scott≈ approximate level C15:57–6:02 .
02 / 4SmarterEveryDay≈ approximate level C11:27–1:31
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03 / 4TED-Ed≈ approximate level C11:40–1:49
, .
04 / 4Practical Engineering≈ approximate level C13:09–3:21
- - .
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4 clips · 4 channels Also heard in these clips