It's a very exiting study in the sense that it's probably the first time we've seen brain imaging evidence of this type from a normal population.

It doesn't change anything from what we already know. There have been reports of that and reports saying the opposite. The jury continues to be out. This is just another paper that throws more weight on this possibility without discounting the other.

It's totally shot ? our New Year's Eve excitement.

It's another piece of the puzzle falling into place, but I would not say it debunks other theories. This particular piece gives more information about what cell division is doing before you get to the disease state.

By staying mentally active, you can delay the onset of Alzheimer's by a few years. Promoting mental agility can be protective.

That's the goal, because we're hopeful that in the near future we'll be able to detect who's going to get it and have pharmaceutical drug interventions so we can stop them from getting it.