Why does your grass grow so much better near your cement walkways?

It is because some cement may allow water to travel downhill or to stop the flow of the water when it's in the soil, and could cause the soil to absorb to water, causing it to grow faster than the others, and when the cement conducts or reflects heat/light, it will go to the nearest place possible, the grass, And sometimes grass doesn't grow well either near walkways because people sometimes walk on the grass, causing it to flatten, or to die.