Why did people help each other after September 11 2001?

How were old fashioned fire extinguishers made? Where is Christa McCauliff's family today? Did anyone survive the crash of United 93? What constitutes dangerous occurrences and hazardous malfunction and why must these be reported? Why habagat brings a lot of rain? What is the fire point of petrolfuel? You are implementing tactical activities to achieve the incident objectives What is the correct title of the ice organizational element to which you are assigned? When did it last rain in calama? When was The Something Rain created? Who are Priorities on evacuation? Are fire alarms allowed to be switched off in a factory if the managing director has given his consent? Why disaster planning is important? Can you use the same transformer for door bell and smoke detector? What happens if you put graphite on fire? Where can someone find information about disaster recovery systems? What did the tragedy of the Triangle Shirtwaist Company fire of 1911 draw national attention to? What can stop fire? What are the main threats to public health in your society? What could be learned after cyclone Tracy? What is the difference between fire retardant and flame retardant coveralls?