Hi, I heard about a researcher of the 1970's. He came to the conclusion through his research, and he was the leading researcher in his time in his field, I think it had to do with genetics and evolution, that it is possible that Darwin's theory of evolution is false.
The only person I can think of that fits this description is Lynn Margulis who pushed the idea of Endosymbiotic theory:
Symbiogenesis - Wikipedia