Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like typical ...

I was on the Today Show today, May 7, 2008. The taped session focused on studies from two separate laboratories. The first study concerned research on twins’ social relationships, conducted in my lab ...

I never believed in love at first sight until I met my now-husband. I couldn't recognize him from his identical twin brother over the phone. We ended up having fraternal twins, and I got to experience ...