And likewise, if we double the viscosity but we keep everything else the same, then we also double our resistance. So by doubling the length or by doubling our viscosity, we can increase the resistance by a factor of two. But let's see what happens if we double our radius. By doubling our radius, we not only double our denominator, we actually increase our denominator by a factor of 16. And that's because the radius is raised to the power of four, and two to the power of four is 16. So if the radius is doubled but everything else is allowed to stay the same, then we decrease our resistance by a factor of 16.