Role and Importance of Data in Public Health. Address the basic concepts, methods, and tools of public health data collection, use, and analysis and why evidence-based approaches are an essential part of public health practice.
Every language in the world-from English to Mandarin-evolved from a prehistoric 'mother tongue' first spoken in Africa tens of thousands of years ago, a new study reveals.
Although the first known text by native speakers dates to 1885, the first record of the language is a list of words recorded in 1793 by Alexander MacKenzie.ecause of the way languages change gradually, it is usually impossible to pinpoint when a given language began to be spoken. In many cases, some form of the language had already been spoken (and even written) considerably earlier than the dates of the earliest extant samples provided here.