Within an open day in the Educational Center of Civil Defense and Emergency Situations of the Republic of Tatarstan, which was organized for the population by employees of the Center in cooperation with the Headquarters of EMERCOM of Russia for the Republic of Tatarstan at the World Civil Defense Day, workers of several enterprises and organizations of Kazan practiced resuscitative measures on training dummy, measured heads for identifying gas mask size and tried to put on gas masks correctly, learned the past and modern history of civil defense.