01 / 30BBC Ideas≈ approximate level A23:57–4:03 's , .
02 / 30TED≈ approximate level A29:10–9:14
.
03 / 30BBC Ideas≈ approximate level A25:00–5:05
.
04 / 30BBC Earth≈ approximate level B21:25–1:29
.
05 / 30Big Think≈ approximate level B26:12–6:18
.
06 / 30BBC Ideas≈ approximate level B11:39–1:46
's .
07 / 30CrashCourse≈ approximate level B212:40–12:46
.
08 / 30TED-Ed≈ approximate level B13:36–3:40
, .
09 / 30Big Think≈ approximate level B27:12–7:19
.
10 / 30The School of Life≈ approximate level C10:53–1:05
, .
11 / 30The School of Life≈ approximate level C10:43–0:51
; .
12 / 30TED≈ approximate level B11:16–1:22
, .
13 / 30The Economist≈ approximate level A21:26–1:31
, .
14 / 30The Economist≈ approximate level B24:06–4:17
.
15 / 30Sprouts≈ approximate level B25:53–6:02
— .
16 / 30TED≈ approximate level B13:12–3:17
, ?
17 / 30BBC Ideas≈ approximate level C10:55–1:04
, , .
18 / 30Big Think≈ approximate level B13:49–3:56
, .
19 / 30WIRED≈ approximate level B29:01–9:09
.
20 / 30Sprouts≈ approximate level B17:34–7:42
, , .
21 / 30The School of Life≈ approximate level B12:23–2:30
, %.
22 / 30The School of Life≈ approximate level B12:22–2:29
, %.
23 / 30PBS NewsHour≈ approximate level C13:44–3:51
, , , .
24 / 30TED-Ed≈ approximate level B24:57–5:07
, , .
25 / 30The Economist≈ approximate level C10:40–0:50
, , .
26 / 30The School of Life≈ approximate level B20:13–0:21
, , .
27 / 30Big Think≈ approximate level C110:10–10:18
, , .
28 / 30TED-Ed≈ approximate level C12:41–2:56
— ’s .
29 / 30Big Think≈ approximate level B19:28–9:41
, , , , .
30 / 30PBS NewsHour≈ approximate level B21:09–1:22
, , 's .