What contributed to the battle of stalingrad becoming a turning point in the war?

I can see two main points that shows the importance of the Battle of Stalingrad:
1] Material: In the battle the Germans lost and entire army (the 6th) with its entire staff of commanding officers including a Field Marshall (von Paulus). This was a staggering loss for a country of limited possibilities in replacing manpower.
2] Psychological: For the first time (and from here on throughout the entire war) the Russian Red Army assumed the initiative in conducting offensive actions. The fact also that the first big defeat in Russia of the German Army happened in a town with the name of Stalin didn’t help the morale.

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.