01 / 7Practical Engineering≈ approximate level C19:30–9:38 , .
02 / 7TED-Ed≈ approximate level B24:41–4:49
, , , .
03 / 7Practical Engineering≈ approximate level C111:00–11:09
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04 / 7The School of Life≈ approximate level C11:13–1:22
, .
05 / 7Practical Engineering≈ approximate level C15:48–5:57
, , .
06 / 7Practical Engineering≈ approximate level C11:07–1:17
’s : , .
07 / 7Practical Engineering≈ approximate level C12:33–2:43
, .