When it comes to the philosophy of survival, no one can provide a definitive explanation. Some people found great happiness in conducting scientific research, solving world challenges brought far more joy than anything else, to the extent that they'd forget about sleeping and everything else.
Some people felt happy simply by eating delicious food, especially the rare, expensive food cloned in sterile labs from alien species. This same group of people worked primarily to eat more of this alien food, though it wasn't necessarily tasty.
Still others found happiness in piloting spaceships or mining, some just loved the sight of ore being smelted into molten iron...
It's hard to rank these different forms of happiness.
Zhang Yuan also felt that humanity shouldn't evolve into a civilization solely for the purpose of studying Nature. Humanities should also prosper, including music, gaming, movies, and other sectors.
