Traces of Alzheimer's detected in some animal species.

[Catherine]

You are right that there are larger amounts of aluminum and other elements in the environment because of human activity.
There is also an increase in the number of people with Alzheimer's. Now we have found signs of Alzheimer's in Dolphins and Chimps.
Is there a connection? That is something we haven't proved. It also isn't disproved.

Alzheimer's develops over a period of years. Whatever causes it may predate any symptoms by many more years. 

This is a pretty good article from a reliable source.

https://www.google.ca/url?sa=t&rct=j&q=&...G8VXQqepBu

We just don't know enough about Alzheimer's. There are  so many variables. Finding that some animals develop Alzheimer's signs in their brains seems to add a whole new set of variables. It also might give us the key to solving the problem. What do we have in common with the animals that do have Alzheimer's. Certainly pollution is worth looking into. There could be some factors there that increase the risk. 

There are a number of studies going on trying to understand the causes. Studying animals could increase our knowledge. By studying, I mean observing. I don't think experimenting on animals is the answer.  Experiments tend to look at whatever the scientist wants to look at. Observational studies would look at the animals in their natural environment. The environment could be tested and the onset of symptoms could be documented. The data would be meaningful because it would be a record of what is happening. 

I hope someone does take up the research in a meaningful way.