What are the measurements by which various items are cancelled? Is there a difference between wine offered as libations to non-Jews and other forbidden items? Is there a difference if it falls into the same type of substance or a different one? If it falls into a mixture that contains the same item and also a different item, do we view that as the same substance or a different substance? Is there a difference if it falls into and gets mixed into the other substance or if it stands on its own and get mixed up with other similar items and it is unknown which item is the forbidden one?