For the first time, a group of twin researchers has made a stab at untangling the roles of heredity and environment in our relationships with companion animals. The research team found that the identical twins pairs were more similar than the fraternal twins in whether they had played with pets.
I teamed up with the well-known developmental psychologist David S. Moore to list eight facts about genes, twin studies and the heritability statistic that may come as a surprise to many people, even biologists!