David Masci, a senior research fellow at the Pew Forum on Religion & Public Life, discusses religious, ethical, and moral perspectives on lifting federal funding limits on embryonic stem cell research.

A Zoroastrian family of Iranian Americans celebrates the Prophet Zoroaster's message of "good thoughts, good words, good deeds."

Estimates vary widely, but some claim that as few as 115,000 Zoroastrians remain—a few in Europe, North America and Iran, but the vast majority are in India, where they are called Parsis.