Scientists know that the eggs of older women are less successful in producing healthy babies, but they don't know the reason why. (sciencedaily.com)
Healthy parents produce healthy babies, and natural fertility is a sign of health. (madisonctnaturopath.com)
Sperm freeze - dried and sent into space for months of exposure to high levels of solar radiation later produced healthy baby mice, researchers report May 22 in Proceedings of the National Academy of Sciences. (sciencenews.org)