01 / 13BBC Ideas≈ approximate level A22:25–2:30 .
02 / 13TED-Ed≈ approximate level A23:45–3:53
’s , .
03 / 13The School of Life≈ approximate level B10:53–1:01
, .
04 / 13CrashCourse≈ approximate level B20:00–0:08
, , , .
05 / 13TED≈ approximate level B12:19–2:27
.
06 / 13The School of Life≈ approximate level B20:01–0:14
: , .
07 / 13CrashCourse≈ approximate level B11:03–1:07
’s , “ .”
08 / 13The School of Life≈ approximate level A22:02–2:07
’s , .
09 / 13The School of Life≈ approximate level A22:01–2:07
’s , .
10 / 13The School of Life≈ approximate level B22:30–2:34
.
11 / 13Big Think≈ approximate level A21:35–1:41
, .
12 / 13TED≈ approximate level B28:49–9:03
, , .
13 / 13Big Think≈ approximate level C15:53–6:04
, .