infertility

A clinic in Kiev, Ukraine, stirs controversy by making babies with DNA from three different people to help women who are infertile bear children. It's the only clinic known to be doing this right now.

Data from nearly 43,000 men around the world found that sperm counts dropped by more than half in Western countries. It could reflect a decline in health overall, scientists say.

Researchers printed gelatin scaffolds into which they placed ovarian tissue, and then implanted the new organs in mice. Three out of seven female mice produced healthy offspring using the technology.

Infertility is often a private struggle. But some couples are going public — via crowdfunding sites — to help subsidize in vitro fertilization treatments that can cost as much as $20,000 each time.

Each twin had an ovary removed and frozen in 2009, when they were in their 30s, in hopes of buying more time to get pregnant and have babies. But will the thawed, reimplanted ovaries work?

Scientists have been able to keep human embryos alive twice as long as before. The technique is reopening a debate over a rule limiting research on human embryos to 14 days.