01 / 19Big Think≈ approximate level A20:42–0:47 .
02 / 19Lex Clips≈ approximate level A20:40–0:48
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03 / 19The Economist≈ approximate level B21:37–1:42
.
04 / 19WIRED≈ approximate level B111:27–11:31
.
05 / 19TED≈ approximate level B18:14–8:16
.
06 / 19PBS NewsHour≈ approximate level B12:04–2:10
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07 / 19The Economist≈ approximate level B10:28–0:39
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08 / 19PBS NewsHour≈ approximate level C15:24–5:28
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09 / 19The Economist≈ approximate level A22:24–2:29
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10 / 19The Economist≈ approximate level B12:06–2:10
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11 / 19CrashCourse≈ approximate level B210:14–10:23
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12 / 19TED≈ approximate level B14:08–4:16
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13 / 19TED≈ approximate level B27:45–7:48
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14 / 19Big Think≈ approximate level C113:05–13:14
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15 / 19The New Yorker≈ approximate level C10:09–0:16
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16 / 19PBS NewsHour≈ approximate level B22:09–2:24
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17 / 19BBC Ideas≈ approximate level B11:31–1:40
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18 / 19The Economist≈ approximate level C15:54–6:02
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19 / 19PBS NewsHour≈ approximate level C13:18–3:31
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