Thank you guys for your answers,
Yes I know how science works, I am an applied engineer. Sometimes my English is not good because it isn't my mother language.
I don't agree with Ben and Retro.
I know that arahants 2000 years ago attained Nibbana without science, but we are not them. I think a smart man must know what era he lives in. That era is different to ours, if you think it isn't important then please don't using internet like them and liberation yourself just like them (joke)
Each era has it own problems, and has it own people under those problems. In the Buddha's era, people had different traditions, different priorities, different inclinations, different questions. It is not easy to live like them, think like them in modern history. And because the sake of the people, the Buddha sometimes answered the doubts of people.
It may not important to some people, but it is important to others.
Well, I think every question has its root. If it arises, if we could answered it or not, it depends on each person and his circumstance. I believe if I ask the Buddha this question, he will not answer me like: it is not important, I myself could attain Nibbana without science (joke). Maybe he could explain it for me, because he even explained many things at first is seemed very unimportant to others.
Just some of my thoughts.
Please stop following me