And some went on to have healthy babies of their own.
The body electrician
Launch the gallery below, and enjoy our favorite pictures of the year, all in one place
Winners of the Nikon's annual Small World competition represent the best in through-the-microscope photography
The process that created Dolly the sheep in 1996 has now been proven successful in humans.
But wait, there's a catch
Everything you need to know about the hottest topic in
medicine, from big-league breakthroughs and new therapies to emerging health risks and the patients willing to take them
UK agency has given approval to use CRISPR to modify embryos, a world-first
Will we grow babies outside their mothers' bodies?
Sex isn't nearly as binary as you think it is.
The winners of the Nikon Small World microvideography contest
A new microscope enables scientists to see the intricate 3-D structure of everything from cartilage to Velcro.
As the U.S. campaigns against terrorism, new technologies will move to the front lines.
Cell biologists get observational omniscience
I remember when you were just two cells big!
On your mark ... get set ... mitosis!
Using nature as a guide, geneticists build plants with qualities evolution could never produce
Teens may be works in progress, but they help society evolve.
The future of test tube babies is one step closer to being motherless
We'll get a vaccine for addiction, debate the future of nuclear power, use new tech to take on water shortages, and-just maybe-find an extra dimension or two. Happy New Year
In the microscope-aided photography competition, these embryos stand out