Where did cherynbyl disaster effect?

How many people die on helicopters crashes? Why is it important to deal with or promptly report risks in a workplace? What does immediate importance mean? What damage is caused at each level of a tornado? What are the factors that cause accidents related to risk management? What is the national incident management system used to do? What is the minimum number of compressions you should give in CPR? Should you call the super or the fire department when the fire alarm goes off and the hallway is full of smoke? What is the maximum effective range of a 15-pound Co2 extinguisher from the outer end of the horn? Can a tornado happen in a house? Were the challenger and the Columbia shuttles replaced? What is the most damaged town by a tornado? What is a battery-operated smoke detector? When did the oil spill in the gulf happen? When is the best time of day to work outside? What areas are in danger of flooding? Why is there a high flood risk after a summer thunderstorm? What kills a person first in a fire smoke or heat? Are challenger and buck mark mags interchangable? Why do you need tornado sirens?