01 / 15Big Think≈ approximate level B21:04–1:10 .
02 / 15NBC News≈ approximate level B21:19–1:25
, .
03 / 15TED-Ed≈ approximate level B10:58–1:01
.
04 / 15CNBC Make It≈ approximate level A24:22–4:26
.
05 / 15Sprouts≈ approximate level B11:34–1:42
.
06 / 15CNBC Make It≈ approximate level B22:09–2:15
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07 / 15TED≈ approximate level C15:18–5:27
, , , .
08 / 15CrashCourse≈ approximate level C10:41–0:49
, .
09 / 15CNBC Make It≈ approximate level A23:32–3:38
.
10 / 15CrashCourse≈ approximate level C16:44–6:58
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11 / 15TED≈ approximate level C111:52–12:03
’s , .
12 / 15PBS NewsHour≈ approximate level B22:39–2:49
, , .
13 / 15StoryCorps≈ approximate level C10:00–0:06
, : .
14 / 15PBS NewsHour≈ approximate level C12:23–2:34
, : .
15 / 15CNBC Make It≈ approximate level B11:54–2:05
, 's , .