I now understand how varied the world of cultivated rice is; that rice can play the lead or be a sidekick; that brown rice is as valuable as white; and that short-grain rice is the bee's knees.
The difference between brown and white rice is that the former is not milled. With the outer bran and germ intact, the rice is therefore chewier and nuttier.
Like brown rice, black rice is unmilled, and it is the dark outer husk that makes it so nutty and chewy. It's also why it takes longer to cook than many other rices.
Nearly all edible seaweeds - or 'sea vegetables,' as they ought technically to be called - belong to one of three broad groups: green, red and brown algae.