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"In Economics in Plain English, the new economic explainer video series from The Atlantic, business editor Derek Thompson answers big and small questions selected from hundreds of reader submissions. Up first: Why is bottled water so expensive? In less than three minutes, Thompson explains what goes into the price of bottles, why all water is more expensive than you think, and why the most expensive component in some bottled water is neither the bottle nor the water."

"Solar is not like other energy sources. Photovoltaic cells are a transformative technology, Alexis Madrigal, The Atlantic's senior technology editor, argues in the short video above. The faster the price of solar energy falls, the more viable it becomes as a source of clean power -- and the sooner we'll see it on roofs across America. Animated by Lindsey Testolin, this clip is part of a six-part video series in The User's Guide to Energy special report. "