That's true. One study after another, and they often contradict each other.
I'm in the research business so I see this kind of thing all the time.
The article linked to above...
New Study Steers Mercury Blame Away From Vaccines Toward Environment: But Where's It Coming From?Points out that propaganda is trying to blame the environment as the source of mercury toxicity when actually it's vaccines, amalgam dental fillings, and probably chemtrails.
The article asks this question: Where is all this mercury in the environment suddenly coming from?Mercury is one of the favorite poisons of the banker/merchants because it causes so many diseases years after you are exposed to it.
The connection between mercury and Autism/ADD/ADHD is clear. There are many studies that show this. There are a couple studies that attempt to break the association between mercury and disease, but these are financed by vaccine makers and they are clearly corrupt studies - designed with a predetermined result in mind.
I've seen both sides of the evidence and the connection is clear to me. In fact, I had numerous ADD/ADHD symptoms most of my life until my amalgam (mercury-based) fillings were removed. Then, all of the symptoms went away.
For in-depth information about this, see these videos:
http://urlbam.com/ha/Qzzzhttp://urlbam.com/ha/9zzhttp://urlbam.com/ha/vzhttp://urlbam.com/ha/M001RI firmly believe that mercury poisoning is intentional. It is taking place legally for the profits of the Rockefeller-controlled pharmaceutical companies and for population control. Here's some interesting information:
http://urlbam.com/ha/M000y