01 / 16TED-Ed≈ approximate level A24:59–5:06 ’s : .
02 / 16BBC Ideas≈ approximate level B11:19–1:26
, .
03 / 16Sprouts≈ approximate level B21:18–1:26
's .
04 / 16CrashCourse≈ approximate level B18:40–8:45
, .
05 / 16Big Think≈ approximate level B26:12–6:18
.
06 / 16TED≈ approximate level B23:53–3:59
, , .
07 / 16CrashCourse≈ approximate level B210:46–10:53
’s “” “” .
08 / 16TED-Ed≈ approximate level B24:23–4:32
, .
09 / 16Big Think≈ approximate level C13:43–3:46
, .
10 / 16CrashCourse≈ approximate level C14:48–4:53
’s .
11 / 16CrashCourse≈ approximate level B111:43–11:50
’s .
12 / 16BBC Ideas≈ approximate level B20:59–1:09
, , .
13 / 16Sprouts≈ approximate level B11:10–1:18
.
14 / 16Big Think≈ approximate level C17:40–7:46
, .
15 / 16TED≈ approximate level B23:51–3:54
.
16 / 16TED≈ approximate level B15:34–5:41
's 's .