So why is there something called Cola Zero....

Thanks for replies, I didn`t get the quote...
By the way, as far as I`ve learned; Yin and Yang, up and down, good and bad, etc, is just concepts in our mind. SFQ talks about the emptiness, so why do they also talk about two "polarities" like Yin and Yang?
Everytime I read about Yin and Yang I never learn something deep about it..