"Lake Algae and Lou Gehrig's Disease"

"There’s a kind of blue and green scum that can bloom in lakes and ponds across the nation. This scum is called cyanobacteria. For years, scientists have known that this stuff can produce dangerous toxins. Amy Quinton reports now researchers are studying whether there’s a link between cyanobacteria and Lou Gehrig’s disease." Aired the week of June 29, 2009.