Why does the United States remain one of the few developed countries to allow children to play with toys that some scientists say may cause infertility in boys? The toys in question contain substances called phthalates (pronounced "thal-ates"). While the European Union has banned these substances in products meant for children, there is powerful resistance from the chemical and toy industries to doing the same here.

NOW Senior Correspondent Maria Hinojosa travels from California, where citizens have successfully gotten the state to pass a ban on phthalates in children's toys, to New York City's prestigious Toy Fair, and to Washington, D.C., to uncover some answers.

Please click here to watch this video. (Follow the "Video: Toxic Toy" link)