Mayim Bialik has come far from the flower-bedecked hats of her ’90s sitcom “Blossom.” Bialik (make that Dr. Bialik) holds a Ph.D. in neuroscience from UCLA, is the author of a book about attachment parenting, is a spokesperson for both the Holistic Moms Network and Texas Instruments and stars on CBS’ “The Big Bang Theory” as neurobiologist Amy Farrah Fowler. Bialik will speak at Saturday’s USA Science and Engineering Festival.

There’s often considered to be a great divide between the arts and the sciences. Do you feel that way?
There’s nothing inherently divided in the brain in terms of not being able to do both. But in general, the more time and energy you focus on one thing, the stronger it gets. When I was in school, I didn’t act at all. Now I don’t really practice neuroscience.

Do you still dabble in it?
I teach neuroscience to middle- and high- schoolers in our homeschooling community. It’s something that stays with me all the time. I can’t forget all the things that I’ve learned. It comes into play more than you’d think.

Why do girls seem to need an extra push to get into science?
I think a lot of it is sociological. There’s nothing inherently different about the female brain. We have to put a tremendous amount of weight on the sociological patterns that for thousands of years didn’t place women in science. Of course there are exceptions, but a lot of it is simply what is seen as normal.

Walter E. Washington Convention Center, 801 Mt. Vernon Place NW, Sat. & Sun., free; 202-249-3000. (Mt. Vernon Square)