>I think nothing is really bad for you in right in normal quantities. That's either false or tautological. Mercury is bad for you in any quantity. If you say "

>I think nothing is really bad for you in right in normal quantities. That's either false or tautological. Mercury is bad for you in any quantity. If you say "the normal quantity for mercury is zero", then "nothing is bad for you in normal quantities" is a meaningless statement.