My mom worked as a secretary for a while and was always amazed at how fast one of her friends could type, compared to her. Turns out she had six fully functiona

My mom worked as a secretary for a while and was always amazed at how fast one of her friends could type, compared to her. Turns out she had six fully functional fingers on each hand and her own method of typing! IIRC the gene for six digits is actually a dominant trait, oddly enough.