Prepared for you by The Open University. (But why, one wonders?)

1. Anglo-Saxon 

2. The Norman Conquest 

3. Shakespeare 

4. The King James Bible 

5. The English of Science 

6. English and Empire 

7. The Age of the Dictionary 

8. American English 

9. Internet English 

10. Global English 

On a more serious level, The Max Planck Institute for Psycholinguistics in Nijmegen has a website which will answer your questions about language. Many have already been answered. The blog Brain’s Idea explains it.