Hunt, a psychologist who studies intelligence, has proposed that nations with the most advanced economies and greatest national wealth are those that make best use of cognitive that is, ways to amplify and extend general cognitive ability.

Katie and her father are looking at the pipes around their house. they find that some of the pipes have rust on them, making them look and feel different than normal pipes. what kind of change have the rusted pipes gone through? a. a physical change b. a vibration change c. a chemical change d. a temperature change