The article discuss the power of being considerate and giving to others in large and very small ways. There is empirical evidence that the body responds in a positive way to these life changes.
A patient with Multiple Sclerosis tried the concept for a month and was found to be less symptomatic.
There have been numerous studies to back up these results. The thought is that altruism might be an antidote to stress, in contrast being self-centered may be damaging to ones health!
So keep holding doors open for others and saying hi to people on campus. You could be a walking medical miracle:-)