Stem Cells, what do they do?

http://stemcells.nih.gov/info/basics/

What i learned from the article

Stem cells have the capability to grow into any cell we want them to. Stem cells continually divide and can continue to do so until the targeted damaged cell is back to full strength. Stem cells can act as any cell in the body, and if used correctly may become a cure for many of today's mutations and diseases. This article taught me some of the capabilities of stem cells and ways we can put them to work.

Questions this article raised...
What are the other potential uses of stem cells?
When will stem cell treatments become widely available?
Why are stem cells not in use today?
Where exactly do they come from?
What proof do they have that stem cells will work in adult humans?

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