Used by Pizza Hut as nothing more than a garnish in its salad bars in the 1990s, kale has exploded in popularity over the last two decades and has become a go-to nutritional powerhouse ...

Case in point: winter greens. Mustard greens, chard, collard greens and kale are some of the most common you’ll see at grocery stores and farmers markets. “Every green has its own specific ...

Some start-ups are giving them a second life – as indoor farms growing crops as varied as kale, cucumber and herbs. Since its 1967 construction, Canada's "Calgary Tower", a 190m (623ft ...