And then when you go over here, at the zero point right here, your slope is pretty much flat, because the horizontal line, y equals 0, is tangent to this curve. And then as you go to more positive x's, then your slope starts increasing. I'm trying to draw a tangent line. And here it's increasing even more. So your slope is changing the entire time. And this is kind of the big change that happens when you go from a line to a curve. A line, your slope is the same the entire time.