... in my lab:

Human heart cells beat under a microscope. They started out as embryonic stem cells.

“The work that we're doing is to try to regenerate the heart after a heart attack. We've been able to take stem cells and turn them into human heart muscles in a dish and we've learned how to make the cells survive after we transplant them," said Chuck Murry, MD, PhD, University of Washington.

Embryonic cells are the only kind of stem cells that do that. But the work has been slowed due to federal restrictions. Dr. Murry is hopeful that will change soon.

Hi Nina! Hi Kareen!

Updated, because I loved this when I came upon it eight long, long, long years ago:
Bush Finds Error In Fermilab Calculations