Is there a difference between being physically identical and only being born on the same day? I knew a pair of non-identical twins when I was a boy. They were proud to be completely different from each other. One was very short-sighted from an early age and wore glasses. He picked up the local accent and was obsessed with trains. His brother spoke with a posh accent and was very musical. The first became a train driver and moved to Scotland. His brother went to a music college in London and became a concert pianist.