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.
As of 2010, 359 million people spoke English as their first language. English is probably the third largest language by number of native speakers, after Mandarin and Spanish. However, when combining native and non-native speakers it is probably the most commonly spoken language in the world.