A discussion of stem cell research in the Danvers Herald provides a good feel for the reasons why research into the human brain is vital to the future healthy life extension. The more we learn, the more we find can go wrong in the aging brain; articles like this make Paul Allen's decision to fund the Brain Atlas project look very smart. Twenty years from now, when most of the major organs in the body can be repaired in situ or regrown from scratch, regenerative neuroscience will become increasingly important. The brain is in a class of its own - the one organ we can't just replace as a matter of last resort. The technologies used to repair aging or damaged brains must, by necessity, be more advanced.