When a woman goes through in-vitro fertilization, doctors often implant multiple embryos to increase the chances at least one of them will be strong enough to survive and grow into a healthy baby.

But that often leads to multiple births, which heightens the risk for complications during pregnancy.

Now scientists in Australia think they've discovered a way to pinpoint which embryos are most likely to be viable.

The study involved taking a few cells from those early embryos, and comparing them with blood and saliva samples from babies who were born as a result of the IVF procedure.

Researchers were able to find out which embryos were viable, and found several genes that differentiated them from the others.

While the science isn't quite ready for clinical setting, researchers say this could someday improve IVF pregnancy rates and cut down on multiples.

In other medical news…

Could a college diploma be the key to living longer?

A new study finds an increasing gap in death rates between Americans who've graduated from college, and those who never finished high school.

Researchers say the overall death rate from all causes decreased significantly from 1992 through 2001 among people with the most education with the largest decrease among black men.

The overall death rate among people with less than a high school education actually increased, particularly among white women.