Birth order is supposedly one of the great determinants of your personality (although the evidence is mixed on this front).

I'm a middle child of four, and it's true: we are peacemakers.  Here's what one researcher said about middle children:  

More than half of US presidents are middleborn – John F Kennedy and Abraham Lincoln are just two examples. The Dalai Lama, Nelson Mandela, Charles Darwin, Ernest Hemingway, Warren Buffett, Donald Trump, Madonna and Bill Gates also hold middle child status.

“They’re more motivated by fairness than money when making life choices, and have a deep sense of family, friends, and loyalty. History shows them to be risk takers and trailblazers, yet they do suffer needlessly from poor self-esteem,” write the authors.

What's your birth order... and do you think it's shaped your personality?