Why doorknobs placed at the edge of a door rather than in the center?

Doorknobs are typically placed at the edge of a door to enhance functionality and ease of use. Positioning the knob closer to the edge allows for better leverage when opening or closing the door, especially when it's heavy. Additionally, this placement aligns with the natural movement of the hand as one reaches for the knob, making it more ergonomic. Lastly, placing the knob at the edge helps maintain the structural integrity of the door by minimizing stress on the door's center.