We know that in the early days of plumbing, wood was used as pipe. But look at what these MIT engineers have come up with!
http://www.boston.com/news/science/blogs/science-in-mind/2014/03/05/mit-engineers-test-low-tech-water-filter-inspired-nature/NSCr2KcepwV238vb7TjT6N/blog.html
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