Everything you need to know about non-woven polypropylene, the fabric now recommended for use as a filter in cloth face masks: What it is, what to look for and where to find it.
Traditional water quality test results tell you what was happening at the beach yesterday. More real-time answers can be a boon for public health.
Even the best engineered filters get clogged eventually. Fish mouths have evolved structures that create unique fluid dynamics patterns that solve that problem.
Using plants to filter water may allow more people to access healthy drinking water. Mechanical engineer Rohit Karnik came…