Why nylon is perferred for making cloths instead of silk?

Nylon was a conceived as a replacement for silk, which was expensive. Silk prices were unstable and had to rely exclusively on the cultivation of a live animal — the silk worm. As a material nylon has transformed our lives. It is lightweight, easily-manufactured and mostly inexpensive.

i think it would be reparing roads  

whose power in the senate is equal to the power of the speaker of the house?