Quran is the best book on art of liveing.why?

Quran is last and final instruction manual for human bieng. no one can wright better book on art of living better than the creater himselfs there fore the quran is the best book on art of liveing.it isthe instruction manual how to led our life. Quran show all what we want.now the human wants the book which show that what is wrong and what is correct. so,human only want to listen in Quran and do it.

Did the khaba is in centre of the world map?did muslim can worship to god by turnig towards centre?

Yes,the Kaaba is in the centre of the world map.when we hold map north pole down and south pole up Kaaba is in centre.when we hold it opposite Kaaba will be in centre.so,muslims can worship god by turning to centre .when we are in west turn to east(and also from east) .when we are in north turn to south(and also from south).

Did the Muslims are worshiping on khaaba?

No, muslims are not worshiping on khaba .They are worshiping Allah through Khaaba .muslims are turning towards them for the unity and for inticating that the god is only one .some are misunderstanding that muslims turning towards Khaaba and worshiping it.Actually muslims worshiping only one god,which have no photo, daughter, father ,mother etc... .