Downwards, downwards when x is greater than zero. So we are switching concavity as we cross x equals zero, and so this tells us that x, so let's see, we are switching signs, switching, let me say g prime prime, switching signs as we cross x equals zero, and our function is defined at x equals zero, and function defined at x equals zero. So we have an inflection point at x equals zero. So inflection point at x is equal to zero. And if you're familiar with the graph of the cube root, you would indeed see an inflection point at that point. So there we go. He was wrong in step three.