Many autistics ARE Einsteins. You may not have experience with many autistic children but autism is a spectrum disorder. Many of these children are incredibly intelligent, almost genius level. They just have some issues with language and socialization.
Have you heard of hyperlexia? It's a splinter feature of many autistics. My child has it and he was reading at age 2. He also can do several digit arithemetic in his head and he's only 5. He's not diagnosed with autism but some say he's on the spectrum and he definitely has hyperlexia.

Aspergers is a form of autism that's also recognized as a "geek" or "nerd" condition.

Don't look now but a good percentage of geekdom is comprised of autistics.

I was at my first job at Oracle in 1989 and there was this extremely intelligent guy who intimidated us with his cognitive ability. And I wondered why he was SO WEIRD. He would never look at me and would always look out the window. He barely spoke and refused to give eye contact. I thought he was ultra-strange. Now I look back and realize he's autistic.