A high-school senior has built a simple water filter using a common tree seed that can effectively remove bacteria such as E. coli and other pollutants. Distributing the easy-to-follow instructions on ...

Filters made from tree branches can purify drinking water sources, a new study finds. Prototypes of these xylem filters, tested in India, show promise as a low-cost, natural filtration option. The ...

Engineers fabricated a simple water filter modeled after the mobula ray’s plankton-filtering features. Pictured are pieces of the filter. Filter feeders are everywhere in the animal world, from tiny ...

The interiors of nonflowering trees such as pine and ginkgo contain sapwood lined with straw-like conduits known as xylem, which draw water up through a tree's trunk and branches. Xylem conduits are ...