Imagine the sudden death of a young husband, the promise of a future together snatched away — except for his sperm, an ethically dubious option for having a family with the one you loved. As discussed ...

As more people turn to donor sperm to grow their families, a new sperm bank is challenging outdated norms.

Researchers at Newcastle University in England report they have coaxed the first human sperm cells from embryonic stem cells, in a remarkable demonstration of how quickly the field of stem-cell ...