Perhaps you've seen the promo on the Weather Channel in which a meteorologist presents a lesson about tornadoes. He fills a blender container with yogurt and milk and blends it on progressively higher speeds. Finally, a student in the class blurts out, "So a tornado is mother nature's way of making a smoothie!" I don't know how apt the comparison is for meteorological purposes but one thing's for sure -- smoothies have become so popular, they're popping up as frequently as tornadoes in Kansas