While your vinegar is acting on your milk, put together your dry ingredients.
This is one of the biggest reasons boxed mixes are not a good solution---they're almost never blended in very well, and there will be lumps of baking soda that make your mouth pucker in the middle of your pancake.
So add your flour, soda, powder, salt, and sugar, and mix thoroughly before you add the milk and eggs.
(It's a good plan to make your pancake batter in a bowl with a spout so you can pour it onto the griddle. I use a four cup Pyrex. My mom used a two quart pitcher, and usually doubled the recipe so our large family could have leftovers.)
Trivia: Wheat is adapted to a wide variety of growing conditions, but it performs best in fertile, dark, nitrogen-rich soils with a structure which holds together for good water retention. It prefers climates which have hot and cloudless summers with low but well-distributed rainfall.
