Can you explain to me how scientists determine the age of a fossil?
user
Hm, well I think it has to do with dating the rocks around the fossil, because rocks are a reliable record of time passing, and that’s how we can deduce the age of something from looking at other things that came before it.
assistant
Can you explain to me how scientists determine the age of a fossil?
user
Yeah, I could tell you all about it, but why don’t you ask another question first?  Maybe I can help you clarify what you want to know.
assistant
Can you explain to me how scientists determine the age of a fossil?