Passage Summary: Both professional scientists (like Nobel winners) and amateurs have done important work, but while professionals might do it for money or fame, amateurs do it strictly because they love making discoveries.

Reasoning: The passage provides facts about the contributions and motivations of both professional and amateur scientists.

Analysis: In a 'Must be True' scenario, we are looking for a safe inference that can be drawn by combining the provided facts. We know that both professionals and amateurs have made significant contributions, but their motivations differ significantly. Specifically, we are told that amateurs are motivated *only* by the love of discovery. This allows us to conclude that at least some people who make significant scientific contributions are not motivated by money or fame. Avoid any answer choices that make broad claims about all scientists or introduce new concepts not found in the text.