karthik poovanam 
Yin and Yang [EPUB ebook] 

Yin and Yang is a popular ancient Chinese concept of two complementary forces in the universe, which work hand in hand, to produce positive energy.
Simply put, one force is positive or otherwise referred to as masculine while the other is negative or otherwise referred to as feminine. Neither is preferred or is better than the other, and both are highly desirable elements when it exists in perfect harmony and balance.