I can read two or even three different genres concurrently, but cannot read even two different of the same type. I cannot read two different tech manuals, or two different spy novels, or two different biographies or autobiographies at the same time, but I could read one of all three and keep them straight. I gotta have a paper book and when I'm not reading it, I am hearing the characters voice and it all runs together to read too many similar at once.