Some years ago, two identical twins were born in Minnesota USA. The two new families both called their babies Jim. Jim Springer never knew that Jim Lewis existed. But when they were 40 years old they were reunited by Dr Thomas Bouchard, professor of psychology at the University of Minnesota. He was investigating how much of our personality depends of our genes. He and his team were very surprised to find the enormous similarities in the two Jims' personalities, lifestyle, hobbies, religion...
Some of them are incredible: Jim Springer's son is called James Allen, and Jim Lewis's is called James Alan. They both have dogs named Toy. They like and hate the same sports and both Jims have the same romantic habit of leaving little love letters for their wives.
Dr Bouchard is convinced that genes are probably much more important in determinatig our personality and preferences than people used to think.