How can you tell how old a fossil is?
How do we know the age of the earth?
How to scientists use isotopes to figure out how old things are?
What is a half-life?
What happens when the number of protons and neutrons becomes the same in radioactive materials?
Who was Henri Becquerel?
Who was Willard Libby?
What is a radioactive isotope?
What is the carbon cycle?
What is the Shroud of Turin?
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