Well, this equation is important because it describes the volume flow rate to the resistance indirectly. So notice that we have a radius on the left side of the equation. And we know that the radius depends on the resistance, or the radius determines the resistance. So let's say by increasing the radius, we decrease our resistance. And from this equation, if we increase the radius, we ultimately increase the volume flow rate. So what this means is if we increase the radius even by a small amount, we increase the volume flow rate by a much greater factor.