Next week on The Exchange, we begin with an update on Alzheimer's disease. Science is developing new ways to diagnose this disease, but a cure is a long way off. Then, a look at the current state of math eduction! With American kids falling behind, debate is raging over the right “equation”…to get them back up to speed. And later, fifty years after Vatican two made radical changes in the Catholic Church…some are calling for a Vatican two, while others would prefer to revert back to the times before the changes of Vatican 2. E-mail us at nhpr.org, and join us for “The Exchange”, every day live at 9 and again at 8 p.m. here on NHPR.