Read this article to get the skinny.  Apparently there is now a helmet that bathes the brain in low level infrared radiation.  It’s predicted that as little as 10 minutes exposure a day can not only stop Alzheimer’s damage, but also partially reverse it.  The article also says IR radiation can help to keep cells active, reducing aging, and possibly improve cognition.  They have yet to do human trials, but it looks interesting, if not promising.