Research shows that stress is mostly created in teens by:
a) exams, money, friends
b) romantic relationships
c) family problems
d) drugs and sex

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. 

Organic -  derived from plants or animalscorrosive -  capable of destroying by a chemical action  particulate -  tiny particle that can be dispersed in a gas 

Ithink that it is the brain.