Psychologists suggest that to cure cruelty

2. Although it hasn't been proved,

1. 
   the first settlers of Roanoke are believed to have been killed by the Indians
   
2. 
   Melungeons are thought to be descendants of the lost settlers of Roanoke
   
3. 
   the boat carrying the first expedition might have capsized on her way to the island
   
4. 
   the Indians living in Croatoan might have concealed something from the searchers
   

3. No one has definitely been able to say that Melungeons are the lost settlers of Roanoke, because

1. 
   there are some other theories about the origins of Melungeons
   
2. 
   Melungeons themselves claim to be descended from Cherokee Indians, living in Tennessee
   
3. 
   historians say Melungeons have never settled on Roanoke Island
   
4. 
   there is no information available as to their ancestry
   

Few animals have such economic significance to humanity yet suffer from such a deplorable image, as does the pig. As a domestic animal, it is a source of a wide variety of meats, high-quality leather, durable bristles for many kinds of brushes, and hundreds of medical products. At the same time, many people frequently regard the pig as unclean and even untouchable. In spite of their reputation, pigs are neither filthy nor stupid. Because their sweat glands are relatively ineffective in lowering body temperature, pigs seek relief from the heat by wallowing in mud or shallow waterholes. When provided with a clean environment sheltered from the sun, however, pigs are fastidious. Furthermore, in tests of intelligence, pigs have proved to be among the smartest of all domestic animals - even more intelligent than dogs.

1.