01 / 17Lex Clips≈ approximate level A20:14–0:21 , .
02 / 17CNBC Make It≈ approximate level B13:00–3:06
.
03 / 17PBS NewsHour≈ approximate level B12:27–2:33
.
04 / 17CrashCourse≈ approximate level A28:08–8:13
, .
05 / 17CNBC Make It≈ approximate level A28:33–8:40
.
06 / 17CrashCourse≈ approximate level B24:36–4:40
, .
07 / 17The Daily Show≈ approximate level B13:59–4:06
.
08 / 17BBC Ideas≈ approximate level B23:12–3:15
.
09 / 17Big Think≈ approximate level B24:07–4:13
.
10 / 17TED-Ed≈ approximate level A21:01–1:04
.
11 / 17The Daily Show≈ approximate level C12:26–2:30
" " . .
12 / 17Big Think≈ approximate level B29:58–10:07
, .
13 / 17CNBC Make It≈ approximate level B16:15–6:20
.
14 / 17Big Think≈ approximate level B27:23–7:31
, .
15 / 17CNBC Make It≈ approximate level C13:16–3:26
, .
16 / 17Big Think≈ approximate level C15:51–6:04
, , , , , , , .
17 / 17Big Think≈ approximate level C13:31–3:41
, , .