1.   Because Chinese excavators are not sure their skills are equal to the challenge of toxic mercury, an assault on the tumulus is being deferred.

2.   Fish in most of the Everglades became off-limits to eating because of toxic mercury contamination.

3.   For that reason, consumption of fish associated with the rigs may present a unique and potent pathway for toxic mercury contamination in humans.

4.   A handful of people had been exposed directly to pure methlymercury, another toxic mercury compound, and died.