Scientists grow mini brains from stem cells

Note: The article mentions that both embryonic and adult stem cells were used.  Some people assert this means that there is no real need to use embryonic stem cells because you can get the same thing from adult stem cells.  On the contrary, as the article asserts, there was no "obvious difference" in the results drawn from embryonic and adult stem cells.  So on the one hand, it is too soon to tell.  And on the other hand, while a process like this is being developed and tested, embryonic stem cells are needed as a basis for comparison.  The question researchers would always need to ask is: If the result of the process is not what was expected, is it due to a fault in adult stem cells versus embryonic stem cells?  That is why they must test with both, embryonic and adult stem cells.

It is simply false to state that embryonic stem cells are not needed because we already get what we need from adult stem cells. (I'm looking at you, Michigan Catholic Conference of Bishops.) 

http://www.cnn.com/2013/08/28/health/stem-cell-brain/