01 / 11Big Think≈ approximate level A20:19–0:22 's , .
02 / 11TED≈ approximate level A26:01–6:05
.
03 / 11The Economist≈ approximate level B17:43–7:46
?
04 / 11BBC Ideas≈ approximate level A24:07–4:21
: , , .
05 / 11BBC Ideas≈ approximate level B24:39–4:43
’s .
06 / 11The Economist≈ approximate level B10:19–0:21
.
07 / 11Vanity Fair≈ approximate level A20:50–0:56
. ?
08 / 11Big Think≈ approximate level B20:00–0:06
, .
09 / 11The Economist≈ approximate level B25:38–5:49
.
10 / 11Sprouts≈ approximate level C13:12–3:23
, .
11 / 11CrashCourse≈ approximate level B23:20–3:30
“ ” , ’s : .