Answer: HPE is a multidisciplinary subject because all the contents related to humans, human health and sound environment come under this subject.
Explanation: In education or academia health, population and environment have different origins but when combined together make a multidisciplinary subject.
Smallpox is the only human disease to have been eradicated by vaccination. The last case was in <span>Somalia in 1977 and was successfully eradicated. Now we have been smallpox free for 30 years!</span>
I mean, find what you want to work on when feeling mentally unstable. I guess just make a goal to what you want to achieve when doing this.