Why Are Stem Cells So Important?

Stem cell research is still very controversial, so why do we want to use stem cells in the first place? Why are they so useful, and what can they do?

Read More:
Researchers Grow Tiny Beating Human Hearts From Stem Cells
http://www.popsci.com/researchers-grow-first-ever-beating-hearts-stem-cells
"Stem cells, the jack-of-all-trades building blocks of human tissues, have yet another application in biology research: scientists have been able to grow them into beating cardiac tissue."

Key Moments in the Stem-Cell Debate
http://www.npr.org/templates/story/story.php?storyId=5252449
"The first embryonic stem cells were isolated in mice in 1981. But it wasn't until 1998 that researchers managed to derive stem cells from human embryos. That kicked into full gear an ethical debate that continues to this day."

Stem cell timeline: The history of a medical sensation
https://www.newscientist.com/article/dn24970-stem-cell-timeline-the-history-of-a-medical-sensation/
"Stem cells are the cellular putty from which all tissues of the body are made. Ever since human embryonic stem cells were first grown in the lab, researchers have dreamed of using them to repair damaged tissue or create new organs, but such medical uses have also attracted controversy."
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