that if you're baking (cookies, cakes or the like) and realize once you've started that you don't have the eggs you needed or you want to make something vegan or egg free you can substitute ground flax meal. . . and it works like a charm!!! All you need to do is put some in a sauce pan with water and heat until it's an egg-like texture and then add it to the recipe.
My resourceful husband taught this to me and we have made some really good breads with it too!