Twin studies are a scientist and media favorite. Because twins share the womb, their pre-natal environment is identical. Their upbringing, in most cases, can also be assumed to be similar -- even more so than for non-twin siblings. However, most twin studies focus on identical twins, in order to control for genetic differences as well. But in ( Read more... )

In a Cal State Fullerton press release (3/29/07), some highlights from a BBC online survey conducted by Richard Lippa are discussed. More complete findings (Blanchard and Lippa, 2007) were published in the April issue of Archives of Sexual Behavior. The survey, which was taken over 200,000 times, found a relationship between hand preference and ( Read more... )