Why is there a pencil if theres a pen

William poole believes economics should be taught in schools because students will learn

Why are radio observatories located in valleys far away from urban centers? a. to shield them from electromagnetic interference b. to avoid sound pollution c. to avoid disturbing people living in the city d. to shield them from water vapor

Some studies have found that what percentage of students have cheated in some form? a. 10% b. 25% c. 45% d. 75%