Beyond the fact that a degree in public health can lead to fulfilling careers in medicine, health care, biotechnology and the life sciences, there is a strong and evidenced need for public health workers in the coming years.
Confidence votes 8. Sanskrit is the oldest language in the world, please see references below. Vedic Sanskrit is the oldest attested language of the Indo-Iranian language family. It is the language of the Vedas, the oldest Shruti texts of Hinduism, compiled over the period of the mid 4th to mid 3rd millennium BCE.
We do not know. That's really the best answer I can give you. Language is around 100,000 years old, and the furthest we have been able to trace back any language is about 20,000 years. In any case, there's not really any meaningful way to claim that any currently spoken language was the first.