How Do They Do It? Season 14 Episode 4 Helmets, Tea, District Heating ( Air Date 2017-01-13 ) Genre Documentary category. Overview "How do they harvest and treat the world's most expensive tea? Plus, how does the Siekierki power plant of Warsaw, Poland heat half the city's homes?".
How Do They Do It? Season 14 Episode 4 Helmets, Tea, District Heating
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