Some organochlorine pesticides are still being used today in the US.  It is now being found that these pesticides are suppressing Vitamin D levels in humans and other animals.  This shows that organochlorines have a longer lasting effect than people thought they did when manufacturing of these chemicals began.  This article talks about how pesticides have been known to thin the egg shells of birds, which we previously discussed in class.  The article says that this further provides data for the hypothesis that organochlorines decrease Vitamin D in animals because Vitamin D is one of the main vitamins that helps to regulate shell thickness. This means that if there is a lower amount of Vitamin D present, there will be a thinner shell present.