171 | The green city: San Francisco, USA 2019-04-03 |
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172 | The History of Wastefulness: The Tipping Point 2019-01-23 |
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173 | The History of Wastefulness: Rubbish Through the Ages 2019-01-16 |
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174 | Making a Difference 2019-01-09 |
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175 | The History of Wastefulness: Today’s Trash Challenge 2019-01-09 |
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176 | The Sun, Our Star: Health and beauty 2019-01-02 |
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177 | The Sun, Our Star: Space weather 2018-12-26 |
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178 | The Sun, Our Star: Ancient sun 2018-12-19 |
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179 | The Sun, Our Star: Energy 2018-12-12 |
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180 | The Sun, Our Star 2018-12-05 |
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