01 / 30BBC Earth≈ approximate level B20:11–0:18 .
02 / 30Big Think≈ approximate level B213:54–13:58
.
03 / 30TED≈ approximate level A21:28–1:33
.
04 / 30BBC Earth≈ approximate level B22:20–2:25
.
05 / 30Lex Clips≈ approximate level B11:12–1:14
...
06 / 30BBC Earth≈ approximate level B20:29–0:36
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07 / 30CrashCourse≈ approximate level B29:51–9:56
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08 / 30TED≈ approximate level B26:10–6:15
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09 / 30PBS NewsHour≈ approximate level B24:28–4:37
.
10 / 30Lex Clips≈ approximate level B10:54–1:04
, .
11 / 30Big Think≈ approximate level B12:47–2:58
, .
12 / 30TED-Ed≈ approximate level A25:35–5:44
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13 / 30PBS NewsHour≈ approximate level A25:34–5:38
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14 / 30CrashCourse≈ approximate level B10:01–0:13
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15 / 30TED≈ approximate level A20:25–0:29
.
16 / 30CrashCourse≈ approximate level B12:03–2:08
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17 / 30CrashCourse≈ approximate level B16:34–6:37
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18 / 30PBS NewsHour≈ approximate level B24:21–4:32
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19 / 30CrashCourse≈ approximate level C12:15–2:28
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20 / 30CrashCourse≈ approximate level B10:13–0:21
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21 / 30Vogue≈ approximate level C18:32–8:39
.
22 / 30Lex Clips≈ approximate level A27:27–7:35
, .
23 / 30Lex Clips≈ approximate level B11:15–1:24
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24 / 30TED≈ approximate level B25:44–5:51
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25 / 30BBC Ideas≈ approximate level C10:29–0:42
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26 / 30Lex Clips≈ approximate level B19:44–9:54
, .
27 / 30TED-Ed≈ approximate level B23:44–3:58
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28 / 30CrashCourse≈ approximate level B21:42–1:51
, .
29 / 30PBS NewsHour≈ approximate level B20:27–0:41
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30 / 30TED-Ed≈ approximate level C10:31–0:47
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