Moon conspiracy theorists think that NASA faked the Apollo mission with a secret program. According to James Longuski, the complexity of the conspiracy theory scenarios make them impossible. More than 400,000 people worked on the Apollo project for almost ten years, and 12 men who walked on the Moon returned to Earth to talk about their experiences. Hundreds of thousands of people would have had to keep the secret. Longuski says that it would have been a lot easier to actually land on the Moon than to create such a large conspiracy to fake it.