The Big Bang Theory

Most of the time, Leonard has no lenses in his glasses.

Despite the fact that some viewers take Sheldon's behavior, mannerisms, and social skills as a sign that Sheldon has Asperger's syndrome or otherwise falls on the autism spectrum, the show-runners have persistently denied in many interviews that Sheldon has Asperger's or any other type of autism. It should be noted however, that actor Jim Parsons has stated that he does think that Sheldon actually does have Asperger's syndrome and portrays him as such.

Mayim Bialik is the only cast member to have a PhD. In 2008, she completed her neuroscience studies. She earned her Ph.D. in Neural Biology.