Psychologists suggest that to cure cruelty

1. The passage seeks to show

1. 
   how brave engineers are when faced with dangerous situations
   
2. 
   how many liters of water are required to extinguish the average hotel fire
   
3. 
   that mathematicians are not as practical as other professionals
   
4. 
   that mathematicians, engineers, and physicists react in the same way in emergencies
   

2. We can conclude from the passage that

1. 
   engineers move from the practical to the theoretical
   
2. 
   this incident happened before the invention of fire extinguishers
   
3. 
   mathematicians are more intelligent than engineers or physicists
   
4. 
   engineering is the most practical of the disciplines mentioned