Can you give an example of a documentary where the person telling the story believed it to be true, but it turned out to be false?

Read also:

• Inhibitory Neurons May Hold the Key to Spatial Learning and Memory - Neuroscience News
• Why do I have the impression that almost all questions about advertising the flat Earth theory come from people who don't believe in a flat Earth themselves and are just provoking?
• Japanese queue for hours as rice shortage deepens - Financial Times
• Why is the covert narcissist actively avoiding me when they see me everyday?
• Do opposites attract? How often do you see weird couples like a guy/girl dating someone who is boring with no sense of humor ?
• What are some negative effects of ADHD meds?
• Thunder-Pacers: 5 takeaways as Shai Gilgeous-Alexander carries OKC to victory in Game 4 - NBA
• What is the reason behind some people referring to themselves as "nice guys" instead of simply being nice?
• Bicycling tied to reduced dementia risk and greater hippocampal volume retention - Medical Xpress
• Fifth measles case in Georgia confirmed in family member of person with earlier case - 11Alive.com