Do you have an example from the last, say 20 years, where an actual amateur made any significant scientific contribution to an established field? I have strong

Do you have an example from the last, say 20 years, where an actual amateur made any significant scientific contribution to an established field? I have strong doubts such a person exists. Simply because science, at the very least, requires you to be aware of what has been done already. Of course there are collaborations between researchers but this is a totally different point.