What did Shakespeare write?
We have always known already that Shakespeare was a collaborator; he was a man of the theatre which is an inherently very collaborative, social art. The news is that he also collaborated as a writer much more than we used to think he did. We can now say with a high degree of certainty that upward of third of his plays were co-written in some sense or other. In most film portrayals, Shakespeare seems to produce his plays in isolation.
