The San Antonio River Authority is looking for a supply of polymer — and interested vendors can request a sludge sample to make sure they’re the right fit. So what does that all mean? And how does ...

Part 2 of Grist’s special series on poop. “We’re trying to get the pieces bigger — ideally the size of pencil erasers,” said John “Rus” Miller, handing me a plastic packet of a brown, dry, crumbly ...