01 / 8Big Think≈ approximate level B110:23–10:29 , , .
02 / 8Big Think≈ approximate level A212:56–13:04
, " , ," .
03 / 8CrashCourse≈ approximate level C10:41–0:49
, .
04 / 8BBC Ideas≈ approximate level C12:54–3:01
, , .
05 / 8TED-Ed≈ approximate level B11:02–1:12
, ’s .
06 / 8The New Yorker≈ approximate level C10:23–0:29
, .
07 / 8CrashCourse≈ approximate level C14:47–5:00
, - “” , .
08 / 8Sprouts≈ approximate level B21:31–1:38
-, .