For decades, scientists have thought that one of the big differences between men and women is that men can make children all their lives because men never stop making sperm. But scientific dogma said women aren't so lucky when it comes to their eggs.
A few years ago, Father Tomasz Trafny was brainstorming with other Vatican officials about what technologies would shape society, and how the Vatican could have an impact. And it hit them: Adult stem cells, which hold the promise of curing the most difficult diseases, are the technology to watch.
"They have not only strong potentiality," says Trafny, "but also they can change our vision of human being[s], and we want to be part of the discussion."