Forbes reports on a small but important step forward in the basics of stem cell science. Researchers have developed a comparatively straightforward way to grow mouse embryos from embryonic stem cells. This conclusively proves that embryonic stem cells can differentiate into any other type of cell (are totipotent). Scientist believe this process will work for human stem cells as well, and so it should help to speed progress towards therapies in many areas of regenerative medicine. If nothing else, it should help to efficiently generate the stem cells needed for future research into preventing and curing age-related conditions.