Stem cells are the Wild West of biomedicine.
The commercially run SpaceX Dragon capsule just delivered mouse stem cells to the International Space Station, part of an experiment to see how long periods in space affect living organisms.
In Scotland, researchers are attempting to make blobs of stem cells in a three-d printer.
And in Italy, terminally ill patients are being given an untested, unproven and theoretically risky stem cell treatment over the protests of scientists.