One example that's stuck with me over the years is where Monarch Butterflies spend the winter. When I was growing up we were told "No one knows", and that was true. Then, in the 1970s, some guy and his girlfriend, who were not scientists, (Kenneth C. Brugger & Catalina Aguado) announced they'd found out where they migrate, high up in the mountains in Mexico, and they were immediately trashed by "professionals" who were quoted in the "News".
At time it seemed very odd to me that they were so quickly and harshly dismissed by the "experts" who hadn't been able to find or confirm where they went.
I prefer to keep an open mind, and in this case it's not a huge leap for me to believe there may be something to this. I wouldn't recommend folks start smoking tobacco but it's worth more study.
There is still vastly more that we don't know than we do know about biology here on earth and that will be the case for at least a very long time and quite possibly, and most likely, our entire human existence.