01 / 12Practical Engineering≈ approximate level C16:58–7:04 , .
02 / 12Practical Engineering≈ approximate level B12:04–2:09
, .
03 / 12TED-Ed≈ approximate level B14:39–4:44
, .
04 / 12Practical Engineering≈ approximate level B25:59–6:06
, - .
05 / 12Practical Engineering≈ approximate level A23:17–3:23
, .
06 / 12Tom Scott≈ approximate level B21:32–1:37
- .
07 / 12Tom Scott≈ approximate level C13:54–4:02
.
08 / 12SmarterEveryDay≈ approximate level B21:08–1:14
, .
09 / 12Tom Scott≈ approximate level C16:56–6:58
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10 / 12Practical Engineering≈ approximate level B12:22–2:29
, .
11 / 12SmarterEveryDay≈ approximate level C11:25–1:32
, , .
12 / 12TED-Ed≈ approximate level B14:19–4:30
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