Stem cells choose the “dark side” in cancer

In 10 seconds? Researchers have discovered that many tumors form from stem cells that acquire cancerous mutations. Research clarifying the roles that cancer stem cells play in tumor development has spurred the development of cancer therapies and deepened our knowledge of cancer's origins.

No way! I thought stem cells had healing powers... It all depends on context. Healthy stem cells cells certainly have healing powers and are even used for some cancer treatments. But, for clarity, let’s define what stem cells are.