MIT engineers made water filters from slices of tree branches that removed more than 99% of E. coli and rotavirus in lab tests — after trials in India, the team designed a gravity-fed prototype that could filter a liter of water an hour

As water crises worsen in developing nations, MIT researchers discovered that nature had already engineered the solution—hidden inside tree branches that cost nearly nothing to harvest. The post MIT engineers made water filters from slices of tree branches th…