You may remember a post I did last summer on sedges called tules. Although not domesticated, tules have (or had) a lot of interesting uses among the Native Americans of California, including in the construction of boats. People still build tule boats, mainly for fun. I bring all this up because of a recent article on some fascinating new thinking about how people spread around the world. It seems that there is increasing evidence that they may have done so by boat, including perhaps during the initial peopling of the Americas from Asia. In which case they could well have gone from kelp bed to kelp bed in tule boats. Incidentally, the oldest boat in the world is a pine dugout made by the Bog People of NW Europe in about 8500 BC.