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.
1 [Leonard] Bloomfield (1933) defines a native language as one learned on one's mother's knee, and claims that no one is perfectly sure in a language that is acquired later. ' 2 The first language a human being learns to speak is his native language; he is a native speaker of this language' (1933: 43).