It was surprising that there are pixels involved. I thought in a world where we have all sort of displays, varying with both size and pixel density, using pixels to measure size of GUI elements is out-of-date.
In iOS all UI measures are expressed in points and not in pixels. Saying 44 pixels is simply wrong. In the iPhone 4 the screen has the exact same size of the 3G but a scale factor of two so every point is two pixel.