01 / 14CrashCourse≈ approximate level B12:25–2:30 .
02 / 14CNBC Make It≈ approximate level C18:53–9:01
, , , .
03 / 14CNBC Make It≈ approximate level B18:46–8:53
.
04 / 14The Economist≈ approximate level B15:02–5:11
, .
05 / 14The Economist≈ approximate level A25:09–5:15
, , - .
06 / 14Big Think≈ approximate level C112:59–13:06
, .
07 / 14Big Think≈ approximate level B20:25–0:30
, .
08 / 14TED-Ed≈ approximate level B23:28–3:36
, , , 's .
09 / 14TED≈ approximate level B24:08–4:20
, , , .
10 / 14Big Think≈ approximate level B212:54–13:00
.
11 / 14Big Think≈ approximate level C10:11–0:23
, , - .
12 / 14CrashCourse≈ approximate level B22:13–2:25
, — , — .
13 / 14Big Think≈ approximate level B15:24–5:35
, , .
14 / 14The Economist≈ approximate level C16:14–6:27
, , , , , , .