In a recent episode of the popular Stuff You Should Know podcast, hosts Josh and Chuck discuss “How Stem Cells Work“–explaining the science and politics of stem cells.

Here is a description of the show from the SYSK website:

Since scientists realized there is a type of cell that can grow into any other type, they have worked to use them to heal human conditions like Parkinson’s and immune disorders. But because stem cells often come from embryos they remain controversial.