] At modest concentrations in aquarium water, the minuscule
] particles -- which are made of carbon atoms and are less
] than one-thousandth the diameter of a human hair --
] triggered damaging biochemical reactions in the brains of
] fish. They also wiped out entire populations of "water
] fleas," tiny animals that fill an ecologically crucial
] niche near the bottom of the aquatic food chain.

[ Progress with caution, friends. -k]