01 / 7The Economist≈ livello approssimativoA26:44–6:47 .
02 / 7Big Think≈ livello approssimativoB23:06–3:11
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03 / 7The Economist≈ livello approssimativoB23:09–3:18
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04 / 7PBS NewsHour≈ livello approssimativoB23:34–3:42
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05 / 7Big Think≈ livello approssimativoB18:38–8:45
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06 / 7PBS NewsHour≈ livello approssimativoC14:12–4:26
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07 / 7TED≈ livello approssimativoC14:56–5:09
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