01 / 11TED-Ed≈ approximate level C13:06–3:10 -- ’ .
02 / 11TED-Ed≈ approximate level B11:36–1:41
, 's .
03 / 11Sprouts≈ approximate level B22:43–2:52
, .
04 / 11TED-Ed≈ approximate level C12:16–2:25
: - , .
05 / 11TED-Ed≈ approximate level C13:03–3:09
, .
06 / 11CrashCourse≈ approximate level C18:06–8:09
- .
07 / 11TED-Ed≈ approximate level B21:48–1:58
, , ’s , .
08 / 11TED-Ed≈ approximate level B22:25–2:29
, .
09 / 11CrashCourse≈ approximate level C13:25–3:35
, , - .
10 / 11CrashCourse≈ approximate level C14:57–5:03
, , .
11 / 11TED-Ed≈ approximate level C10:20–0:36
; , - ; , , — ’s .