I should warn you that Zinc was not 'invented' - it was discovered. I can tell you that Zinc is the heaviest of the first series of transition metals, which means that it has some funky electron shell dynamics along with all of the other transition metals, which are a large part of the reason why they are metals. Zinc is biologically important in trace amounts for all kinds of reasons. I believe, although I am not certain, that bananas are fairly rich in it. Whole wheat bread also contains Zinc.