Although science is a branch of study that is built upon testable explanations and predictions about the natural world and its phenomena, there have been examples in the past when the desire for fame, fortune or trickery beat out the desire for performing solid science.
A video by list25 has assembled the 25 greatest scientific hoaxes in history. Among them are a nonexistent stone-age tribe, a perpetual motion machine and an archeologist that buried objects only to ‘discover’ them later.