Welcome to the Saturday edition of The Conversation U.S.’s Daily newsletter.

Henry David Thoreau’s most famous contributions are literary: his book ‘Walden,’ an account of his time spent living simply in the woods of Concord, Massachusetts, and his writings about social activism and abolitionism. The new Ken Burns documentary on Thoreau largely presents this familiar portrait. But Robert M. Thorson, a geologist at the University of Connecticut who has written an upcoming book about the famous transcendentalist, writes that side of him is not the whole story.

During his time in his cabin near Walden Pond, Thoreau wasn’t just writing philosophical musings. He was also conducting what many researchers have argued is rigorous and pioneering physical and environmental science. He recorded seasonal patterns in nature, studied the hydrology of local waterways and came up with an astute theory on the geological history of the region. While Thoreau’s science isn’t as widely celebrated as his other achievements, Thorson says understanding Thoreau’s activities as a scientist allows us to see his trademark ‘Walden’ in a whole new light.

“The Thoreau who built literary castles in the air put the solid foundations of physical science beneath them,” writes Thorson.

This week we also liked stories about plug-in balcony solar panels, the long history of advertisement to make people love coal, and why sales of U.S. wine, beer and spirits are tanking north of the border.

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