Just as people can't believe Shakespeare could have written all those plays, it's hard for some to believe that Einstein could have written three brilliant papers which completely revolutionalized physics, all published the same year when he was just twenty-six. In addition to crediting his first wife with some of alleged that he pilfered the great mathematician David Hilbert without credit. But historians going through his archived writings have found that he was working on his theories when he was only in his late teens, long before he met his first wife, or would have known of Hilbert, and have concluded that they were all indeed the work of a single (and singular) genius.
I once tried to google the 'Einstein stole his ideas' matter and the only info that came up was from Neo Nazi sites. So much for that matter.