Probably related:

More students with neurological Tourette's-like tics in NY:
[link to www.usatoday.com]

Quoting from the article: "...previously said tests had ruled out medical disorders, diseases and environmental factors."

And: "She reiterated that earlier testing had ruled out environmental contaminants or infections as a cause."

Lol, they sure are making sure you don't even THINK about environmental causes, like H2S. Well, how could they rule that out? A cloud wafts in, wafts out. Leaves little or no trace inside these students' bodies. They CAN'T rule that out, but they sure do want you to THINK they can.

Okay, here's the Wiki H2S link again:
[link to en.wikipedia.org]

Quote: "Hydrogen sulfide is considered a broad-spectrum poison, meaning that it can poison several different systems in the body, although the nervous system is most affected. The toxicity of H2S is comparable with that of hydrogen cyanide."

People losing their ability to speak intelligibly - the 'burtations'. These nervous tics in NY. The 'head-bobbing' illness spreading across Uganda. All indicators of neurological damage. What might they all have in common? An environmental neurological poison, like hydrogen sulfide, with a planetary-scale source of emissions: the oceans. A hit-and-run poison that leaves little or no trace of itself.