From sciencemag.org: Ancient underwater garden discovered in Canada.

Archaeologists have discovered the earliest known garden in the Pacific Northwest—and it was underwater. The site, about 30 kilometers east of Vancouver, Canada, on land belonging to the Native American group Katzie First Nation, was once part of an ecologically rich wetland. It was divided into two parts: one on dry land, where people lived and built their homes, and one that was underwater. In the underwater section, people had arranged small stones into a [continue]