Turn oven to 450°F. Sift flours, baking soda, and salt into a large bowl. Make a well in the center. Pour in the milk, buttermilk, or yogurt. Using one hand and turning the bowl with the other, mix the ingredients from the outside to the center. You want a soft, not sticky, dough, so add a handful of whole wheat flour if needed, and bring it all together as quickly as possible.