BOLD EXPERIMENT: A New York hospital hopes to do the first uterus transplant in the U.S., although not “in the near future.” An attempt in Saudi Arabia in 2000 failed.

WHO WOULD BENEFIT? Women who have had hysterectomies or whose wombs are damaged or defective, preventing them from bearing children.

WHAT CRITICS SAY: More experiments in animals are needed, and there are many less-risky options, such as adopting or using a surrogate mother.