01 / 10TED-Ed≈ approximate level C10:53–1:02 “ ,” .
02 / 10TED-Ed≈ approximate level B11:02–1:12
, ’s .
03 / 10CrashCourse≈ approximate level A26:21–6:27
, “ .”
04 / 10TED-Ed≈ approximate level C12:42–2:52
- , .
05 / 10TED-Ed≈ approximate level C13:43–3:55
, ’s , .
06 / 10WIRED≈ approximate level B23:11–3:21
, , - .
07 / 10CNBC Make It≈ approximate level C13:31–3:37
.
08 / 10TED≈ approximate level C110:37–10:40
, ?
09 / 10TED-Ed≈ approximate level B21:05–1:17
, -, .
10 / 10CNBC Make It≈ approximate level C12:18–2:27
's , , 's -, , .