01 / 10TED-Ed≈ approximate level B23:22–3:28 , , .
02 / 10Practical Engineering≈ approximate level C15:59–6:03
.
03 / 10Practical Engineering≈ approximate level C15:28–5:31
.
04 / 10Mark Rober≈ approximate level C10:48–0:50
.
05 / 10Practical Engineering≈ approximate level C19:46–9:51
.
06 / 10Practical Engineering≈ approximate level C13:25–3:32
, .
07 / 10Practical Engineering≈ approximate level C13:27–3:34
.
08 / 10Practical Engineering≈ approximate level C13:37–3:42
’s .
09 / 10Practical Engineering≈ approximate level B110:11–10:17
.
10 / 10Practical Engineering≈ approximate level C15:00–5:08
, , ’s .