Companies that solve real problems make for compelling investment opportunities on Shark Tank—particularly when the problem is a health crisis. “Your product is not a water filter; your product is ...

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 ...

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 ...