Like someone mentioned before on HN it maybe due to some removal or ban of a substance that was widely in use like for example leaded gasoline.
It is going to be difficult if not impossible to prove what it was but either way we should be extremely careful what materials and chemicals we use especially ones that can cause hormonal changes or damage DNA. Even more we should be careful what we expose kids to before they are fully developed.
It is going to be difficult if not impossible to prove what it was but either way we should be extremely careful what materials and chemicals we use especially ones that can cause hormonal changes or damage DNA. Even more we should be careful what we expose kids to before they are fully developed.