This seems like common sense, doesn’t it? We know that other metals, like mercury and lead, are extremely dangerous to the brain in virtually any amount, no matter how small.
Common sense? Um, what about all the metals our bodies need to be healthy? Shall we now consider all metals harmful because "other metals, like mercury and lead, are extremely dangerous to the brain in virtually any amount, no matter how small." Really, dangerous in any amount, no matter how small?