By studying twins, scientists help us understand what makes people who they are
By Emily Sohn, 00:00 AM December 10, 2008
Identical twins form when a fertilized embryo splits into two embryos early in development. These twins get the same genes from their parents, but such siblings aren't the same people.
I have a friend who looks just like me. We both have light brown hair that we wear pulled back, often in pigtails. We dress in the same types of sporty clothes. Our glasses have thick rims and a blue tint. We are both journalists, athletes and moms to little kids. Even our husbands loo...
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