In geometric terms, a sphere is defined as a set of points that are a given distance from a given point. The given point is called the center of the sphere, and the given distance from the center of the sphere to the set of points that form the sphere is...

It can be very difficult to watch your friend struggle with drug use. Unfortunately, drugs impair the brain which makes it difficult for your friend to make rational decisions. This can result in some very self-destructive behavior. Therefore, providing e...