Psychology as a science that is: a. Studied and only a few countries are in the world
b. Led by one over arcing professional association located in Europe
c. Global, with most countries have some professional association
d. Primarily studied in the United States

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

My funny joke is my friend can no roll over