Spoken in 5 clips from 3 channels · B1–C1
01 / 5TED-Ed≈ approximate level B10:53–1:02 .
02 / 5TED-Ed≈ approximate level B10:43–0:54
's , , , - , , .
03 / 5TED≈ approximate level B13:35–3:42
, .
04 / 5TED≈ approximate level B26:35–6:38
.
05 / 5Big Think≈ approximate level C14:24–4:39
, : , , , .
Keep “serotonin” until you know it
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5 clips · 3 channels Also heard in these clips