As I said earlier, worldly science tries to deal with the diverse things that exist in this world around us. In contrast, spiritual science tries to see the unified view of this apparently diverse world.
The main contribution of the Upanishads is to declare that the apparent diversity is only superficial. Underneath this diversity, there is unity.
So the story we have been discussing, namely the story of father Uddalaka and son Swetaketu, starts off with the fundamental question of “how did this world come into existence?”